avformat/electronicarts: use 64bit variable for avio_tell() result

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

libavformat/electronicarts.c

@@ -351,7 +351,7 @@ static int process_ea_header(AVFormatContext *s)
     int i;
 
     for (i = 0; i < 5 && (!ea->audio_codec || !ea->video_codec); i++) {
-        unsigned int startpos = avio_tell(pb);
+        uint64_t startpos     = avio_tell(pb);
         int err               = 0;
 
         blockid = avio_rl32(pb);