dav1d/ivf: return an error when fread fails

Fixes #66. Also fixes a leak of the demuxer context.

tools/dav1d.c

@@ -88,8 +88,10 @@ int main(const int argc, char *const *const argv) {
         return res;
     }
     for (unsigned i = 0; i <= cli_settings.skip; i++) {
-        if ((res = input_read(in, &data)) < 0)
+        if ((res = input_read(in, &data)) < 0) {
+            input_close(in);
             return res;
+        }
         if (i < cli_settings.skip) dav1d_data_unref(&data);
     }
 

tools/input/ivf.c

@@ -93,8 +93,11 @@ static int ivf_read(IvfInputContext *const c, Dav1dData *const buf) {
     fseek(c->f, 8, SEEK_CUR); // skip timestamp
     const ptrdiff_t sz = rl32(data);
     dav1d_data_create(buf, sz);
-    if ((res = fread(buf->data, sz, 1, c->f)) != 1)
+    if ((res = fread(buf->data, sz, 1, c->f)) != 1) {
         fprintf(stderr, "Failed to read frame data: %s\n", strerror(errno));
+        dav1d_data_unref(buf);
+        return -1;
+    }
 
     return 0;
 }