video/image_writer: check for write errors

make sure that fwrite is error checked. and if any data was still
remaining on the buffer, it will be flushed - and errors checked - via
the fclose() call below.

1 files changed, 2 insertions, 3 deletions

diff --git a/video/image_writer.c b/video/image_writer.c
index a61455d6f3..8cdd5e98ef 100644
--- a/video/image_writer.c
+++ b/video/image_writer.c
@@ -127,7 +127,7 @@ static enum AVPixelFormat replace_j_format(enum AVPixelFormat fmt)
 
 static bool write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, const char *filename)
 {
-    FILE* fp = fopen(filename, "wb");
+    FILE *fp = fopen(filename, "wb");
     if (!fp) {
         MP_ERR(ctx, "Error opening '%s' for writing!\n", filename);
         return false;
@@ -229,9 +229,8 @@ static bool write_lavc(struct image_writer_ctx *ctx, mp_image_t *image, const ch
     ret = avcodec_receive_packet(avctx, pkt);
     if (ret < 0)
         goto error_exit;
-    success = true;
 
-    fwrite(pkt->data, pkt->size, 1, fp);
+    success = fwrite(pkt->data, pkt->size, 1, fp) == 1;
 
 error_exit:
     avcodec_free_context(&avctx);