mpeg4: fix typo in mpeg4_encode_gop_header()

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

libavcodec/mpeg4videoenc.c

@@ -836,8 +836,8 @@ static void mpeg4_encode_gop_header(MpegEncContext * s){
     s->last_time_base= FFUDIV(time, s->avctx->time_base.den);
 
     seconds= FFUDIV(time, s->avctx->time_base.den);
-    minutes= FFUDIV(seconds, 60); FFUMOD(seconds, 60);
-    hours  = FFUDIV(minutes, 60); FFUMOD(minutes, 60);
+    minutes= FFUDIV(seconds, 60); seconds = FFUMOD(seconds, 60);
+    hours  = FFUDIV(minutes, 60); minutes = FFUMOD(minutes, 60);
     hours  = FFUMOD(hours  , 24);
 
     put_bits(&s->pb, 5, hours);