h264: remove unused variable

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

libavcodec/h264.c

@@ -2146,7 +2146,6 @@ static void idr(H264Context *h)
 /* forget old pics after a seek */
 static void flush_change(H264Context *h)
 {
-    int i;
     h->outputed_poc = h->next_outputed_poc = INT_MIN;
     h->prev_interlaced_frame = 1;
     idr(h);