mov: Remove write-only variable in mov_read_chan().

libavformat/mov.c:597:25: warning: variable ‘cflags’ set but not used

libavformat/mov.c

@@ -624,9 +624,9 @@ static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
     label_mask = 0;
     for (i = 0; i < num_descr; i++) {
-        uint32_t label, cflags;
+        uint32_t label;
         label     = avio_rb32(pb);          // mChannelLabel
-        cflags    = avio_rb32(pb);          // mChannelFlags
+        avio_rb32(pb);                      // mChannelFlags
         avio_rl32(pb);                      // mCoordinates[0]
         avio_rl32(pb);                      // mCoordinates[1]
         avio_rl32(pb);                      // mCoordinates[2]