pnmenc: switch to ff_alloc_packet2().

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

libavcodec/pnmenc.c

@@ -32,10 +32,9 @@ static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     int i, h, h1, c, n, linesize, ret;
     uint8_t *ptr, *ptr1, *ptr2;
 
-    if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
+    if ((ret = ff_alloc_packet2(avctx, pkt, avpicture_get_size(avctx->pix_fmt,
                                                        avctx->width,
                                                        avctx->height) + 200)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
         return ret;
     }