fixing warning

md5.c:150: warning: passing argument 2 of 'av_md5_update' from incompatible pointer type

Originally committed as revision 11665 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/md5.c

@@ -147,7 +147,7 @@ void av_md5_final(AVMD5 *ctx, uint8_t *dst){
     while((ctx->len & 63)<56)
         av_md5_update(ctx, "", 1);
 
-    av_md5_update(ctx, &finalcount, 8);
+    av_md5_update(ctx, (uint8_t*)&finalcount, 8);
 
     for(i=0; i<4; i++)
         ((uint32_t*)dst)[i]= le2me_32(ctx->ABCD[3-i]);