Use reget_buffer instead of get_buffer. Fixes issue1367.

Patch by jarkko.palviainen.sesca.com.

Originally committed as revision 19814 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/flashsv.c

@@ -162,9 +162,9 @@ static int flashsv_decode_frame(AVCodecContext *avctx,
         h_blocks, v_blocks, h_part, v_part);
 
     s->frame.reference = 1;
-    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
-    if (avctx->get_buffer(avctx, &s->frame) < 0) {
-        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if(avctx->reget_buffer(avctx, &s->frame) < 0){
+      av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
       return -1;
     }