xmv: Remove superfluous zeroing of already zero'd data

Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

libavformat/xmv.c

@@ -226,17 +226,8 @@ static int xmv_read_header(AVFormatContext *s,
     /* Initialize the packet context */
 
     xmv->next_packet_offset = avio_tell(pb);
-
-    xmv->next_packet_size = this_packet_size - xmv->next_packet_offset;
-    xmv->this_packet_size = 0;
-
-    xmv->video.current_frame = 0;
-    xmv->video.frame_count   = 0;
-    xmv->video.pts           = 0;
-    xmv->video.last_pts      = 0;
-
-    xmv->current_stream = 0;
-    xmv->stream_count   = xmv->audio_track_count + 1;
+    xmv->next_packet_size   = this_packet_size - xmv->next_packet_offset;
+    xmv->stream_count       = xmv->audio_track_count + 1;
 
     return 0;
 }