xwdenc: switch to ff_alloc_packet2().

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

libavcodec/xwdenc.c

@@ -148,8 +148,7 @@ static int xwd_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     header_size = XWD_HEADER_SIZE + WINDOW_NAME_SIZE;
     out_size    = header_size + ncolors * XWD_CMAP_SIZE + avctx->height * lsize;
 
-    if ((ret = ff_alloc_packet(pkt, out_size)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
+    if ((ret = ff_alloc_packet2(avctx, pkt, out_size)) < 0) {
         return ret;
     }
     buf = pkt->data;