Revert "raw: move buffer size check up."

This reverts commit cc5dd632.
The change was redundant, it has been fixed long ago (422e3a74)

Conflicts:

	libavcodec/rawdec.c

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

libavcodec/rawdec.c

@@ -155,9 +155,6 @@ static int raw_decode(AVCodecContext *avctx,
         frame->top_field_first  = context->tff;
     }
 
-    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
-        return -1;
-
     if (avctx->width <= 0 || avctx->height <= 0) {
         av_log(avctx, AV_LOG_ERROR, "w/h is invalid\n");
         return AVERROR(EINVAL);
@@ -190,6 +187,9 @@ static int raw_decode(AVCodecContext *avctx,
        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
         buf += buf_size - context->length;
 
+    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
+        return -1;
+
     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
        (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {