libsepol: fix unknown magic section number error message

When running hll/pp on some invalid policy module, it can output:

    libsepol.sepol_module_package_read: unknown magic number at section
    1, offset: 251, number: 0x

The last number looks funny and was caused by using "%ux". "u" is not a
prefix like "l", "h", "z"... and "%x" already expects an unsigned
integer (cf. http://man7.org/linux/man-pages/man3/printf.3.html).

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>

libsepol/src/module.c

@@ -627,7 +627,7 @@ int sepol_module_package_read(sepol_module_package_t * mod,
 		default:
 			/* unknown section, ignore */
 			ERR(file->handle,
-			    "unknown magic number at section %u, offset: %zx, number: %ux ",
+			    "unknown magic number at section %u, offset: %zx, number: %x ",
 			    i, offsets[i], le32_to_cpu(buf[0]));
 			break;
 		}