Add av_uninit macro to variable to avoid false positive warning:

libavcodec/qtrleenc.c: In function ‘qtrle_encode_frame’:
libavcodec/qtrleenc.c:113: warning: ‘bulkcount’ may be used uninitialized in this function

Originally committed as revision 17155 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/qtrleenc.c

@@ -116,7 +116,7 @@ static void qtrle_encode_line(QtrleEncContext *s, AVFrame *p, int line, uint8_t
     unsigned int skipcount;
     /* This will be the number of consecutive equal pixels in the current
      * frame, starting from the ith one also */
-    unsigned int repeatcount;
+    unsigned int av_uninit(repeatcount);
 
     /* The cost of the three different possibilities */
     int total_bulk_cost;