eamad: release the reference frame on video size changes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 6c1fb3e763)

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

libavcodec/eamad.c

@@ -273,6 +273,8 @@ static int decode_frame(AVCodecContext *avctx,
         avcodec_set_dimensions(avctx, s->width, s->height);
         if (t->frame.data[0])
             avctx->release_buffer(avctx, &t->frame);
+        if (t->last_frame.data[0])
+            avctx->release_buffer(avctx, &t->last_frame);
     }
 
     t->frame.reference = 1;