sunrast: Return AVERROR values instead of -1.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavcodec/sunrast.c

@@ -72,13 +72,14 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
     uint8_t *ptr;
     const uint8_t *bufstart = buf;
+    int ret;
 
     if (avpkt->size < 32)
         return AVERROR_INVALIDDATA;
 
     if (AV_RB32(buf) != RAS_MAGIC) {
         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     w         = AV_RB32(buf + 4);
@@ -95,15 +96,15 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
     }
     if (type > RT_FORMAT_IFF) {
         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
     if (av_image_check_size(w, h, 0, avctx)) {
         av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
     if (maptype & ~1) {
         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
 
@@ -119,7 +120,7 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
-            return -1;
+            return AVERROR_INVALIDDATA;
     }
 
     if (p->data[0])
@@ -127,9 +128,9 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
 
     if (w != avctx->width || h != avctx->height)
         avcodec_set_dimensions(avctx, w, h);
-    if (avctx->get_buffer(avctx, p) < 0) {
+    if ((ret = avctx->get_buffer(avctx, p)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
+        return ret;
     }
 
     p->pict_type = AV_PICTURE_TYPE_I;
@@ -145,7 +146,7 @@ static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
 
         if (maplength % 3 || maplength > 768) {
             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
-            return -1;
+            return AVERROR_INVALIDDATA;
         }
 
         ptr = p->data[1];