flashsv: only realloc blocks for version 2

Fixes 10l regression introducing a memleak
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/flashsv.c

@@ -322,9 +322,10 @@ static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
         s->keyframedata = av_realloc(s->keyframedata, avpkt->size);
         memcpy(s->keyframedata, avpkt->data, avpkt->size);
     }
-    s->blocks = av_realloc(s->blocks,
-                            (v_blocks + !!v_part) * (h_blocks + !!h_part)
-                            * sizeof(s->blocks[0]));
+    if(s->ver == 2)
+        s->blocks = av_realloc(s->blocks,
+                                (v_blocks + !!v_part) * (h_blocks + !!h_part)
+                                * sizeof(s->blocks[0]));
 
     av_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
             s->image_width, s->image_height, s->block_width, s->block_height,