diff --git a/package/utils/fritz-tools/src/fritz_cal_extract.c b/package/utils/fritz-tools/src/fritz_cal_extract.c
index 2978d86e0c..9899cd53c3 100644
--- a/package/utils/fritz-tools/src/fritz_cal_extract.c
+++ b/package/utils/fritz-tools/src/fritz_cal_extract.c
@@ -48,86 +48,86 @@ static inline size_t special_min(size_t a, size_t b)
    is an error reading or writing the files. */
 static int inf(FILE *source, FILE *dest, size_t limit, size_t skip)
 {
-    int ret;
-    size_t have;
-    z_stream strm;
-    unsigned char in[CHUNK];
-    unsigned char out[CHUNK];
+	int ret;
+	size_t have;
+	z_stream strm;
+	unsigned char in[CHUNK];
+	unsigned char out[CHUNK];
 
-    /* allocate inflate state */
-    strm.zalloc = Z_NULL;
-    strm.zfree = Z_NULL;
-    strm.opaque = Z_NULL;
-    strm.avail_in = 0;
-    strm.next_in = Z_NULL;
-    ret = inflateInit(&strm);
-    if (ret != Z_OK)
-        return ret;
+	/* allocate inflate state */
+	strm.zalloc = Z_NULL;
+	strm.zfree = Z_NULL;
+	strm.opaque = Z_NULL;
+	strm.avail_in = 0;
+	strm.next_in = Z_NULL;
+	ret = inflateInit(&strm);
+	if (ret != Z_OK)
+		return ret;
 
-    /* decompress until deflate stream ends or end of file */
-    do {
-        strm.avail_in = fread(in, 1, CHUNK, source);
-        if (ferror(source)) {
-            (void)inflateEnd(&strm);
-            return Z_ERRNO;
-        }
-        if (strm.avail_in == 0)
-            break;
-        strm.next_in = in;
+	/* decompress until deflate stream ends or end of file */
+	do {
+		strm.avail_in = fread(in, 1, CHUNK, source);
+		if (ferror(source)) {
+			(void)inflateEnd(&strm);
+			return Z_ERRNO;
+		}
+		if (strm.avail_in == 0)
+			break;
+		strm.next_in = in;
 
-        /* run inflate() on input until output buffer not full */
-        do {
-            strm.avail_out = CHUNK;
-            strm.next_out = out;
-            ret = inflate(&strm, Z_NO_FLUSH);
-            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
-            switch (ret) {
-            case Z_NEED_DICT:
-                ret = Z_DATA_ERROR;     /* and fall through */
-            case Z_DATA_ERROR:
-            case Z_MEM_ERROR:
-                (void)inflateEnd(&strm);
-                return ret;
-            }
-            have = special_min(limit, CHUNK - strm.avail_out) - skip;
-            if (fwrite(&out[skip], have, 1, dest) != 1 || ferror(dest)) {
-                (void)inflateEnd(&strm);
-                return Z_ERRNO;
-            }
-	    skip = 0;
-	    limit -= have;
-        } while (strm.avail_out == 0 && limit > 0);
+		/* run inflate() on input until output buffer not full */
+		do {
+			strm.avail_out = CHUNK;
+			strm.next_out = out;
+			ret = inflate(&strm, Z_NO_FLUSH);
+			assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
+			switch (ret) {
+			case Z_NEED_DICT:
+				ret = Z_DATA_ERROR;     /* and fall through */
+			case Z_DATA_ERROR:
+			case Z_MEM_ERROR:
+				(void)inflateEnd(&strm);
+				return ret;
+			}
+			have = special_min(limit, CHUNK - strm.avail_out) - skip;
+			if (fwrite(&out[skip], have, 1, dest) != 1 || ferror(dest)) {
+				(void)inflateEnd(&strm);
+				return Z_ERRNO;
+			}
+		skip = 0;
+		limit -= have;
+		} while (strm.avail_out == 0 && limit > 0);
 
-        /* done when inflate() says it's done */
-    } while (ret != Z_STREAM_END && limit > 0);
+		/* done when inflate() says it's done */
+	} while (ret != Z_STREAM_END && limit > 0);
 
-    /* clean up and return */
-    (void)inflateEnd(&strm);
-    return (limit == 0 ? Z_OK : (ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR));
+	/* clean up and return */
+	(void)inflateEnd(&strm);
+	return (limit == 0 ? Z_OK : (ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR));
 }
 
 /* report a zlib or i/o error */
 static void zerr(int ret)
 {
-    switch (ret) {
-    case Z_ERRNO:
-        if (ferror(stdin))
-            fputs("error reading stdin\n", stderr);
-        if (ferror(stdout))
-            fputs("error writing stdout\n", stderr);
-        break;
-    case Z_STREAM_ERROR:
-        fputs("invalid compression level\n", stderr);
-        break;
-    case Z_DATA_ERROR:
-        fputs("invalid or incomplete deflate data\n", stderr);
-        break;
-    case Z_MEM_ERROR:
-        fputs("out of memory\n", stderr);
-        break;
-    case Z_VERSION_ERROR:
-        fputs("zlib version mismatch!\n", stderr);
-    }
+	switch (ret) {
+	case Z_ERRNO:
+		if (ferror(stdin))
+			fputs("error reading stdin\n", stderr);
+		if (ferror(stdout))
+			fputs("error writing stdout\n", stderr);
+		break;
+	case Z_STREAM_ERROR:
+		fputs("invalid compression level\n", stderr);
+		break;
+	case Z_DATA_ERROR:
+		fputs("invalid or incomplete deflate data\n", stderr);
+		break;
+	case Z_MEM_ERROR:
+		fputs("out of memory\n", stderr);
+		break;
+	case Z_VERSION_ERROR:
+		fputs("zlib version mismatch!\n", stderr);
+	}
 }
 
 static unsigned int get_num(char *str)