raw: forward avpicture_fill() error code in raw_decode().

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

libavcodec/rawdec.c

@@ -119,6 +119,7 @@ static int raw_decode(AVCodecContext *avctx,
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     RawVideoContext *context = avctx->priv_data;
+    int res;
 
     AVFrame   *frame   = data;
     AVPicture *picture = data;
@@ -156,7 +157,9 @@ static int raw_decode(AVCodecContext *avctx,
        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
         buf += buf_size - context->length;
 
-    avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
+    if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
+                              avctx->width, avctx->height)) < 0)
+        return res;
     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
        (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {
         frame->data[1]= context->palette;