chardev: add error reporting for qemu_chr_new_from_opts

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/vl.c b/vl.c
index 15e0280..8ce2b10 100644
--- a/vl.c
+++ b/vl.c
@@ -2238,11 +2238,14 @@
 
 static int chardev_init_func(QemuOpts *opts, void *opaque)
 {
-    CharDriverState *chr;
+    Error *local_err = NULL;
 
-    chr = qemu_chr_new_from_opts(opts, NULL);
-    if (!chr)
+    qemu_chr_new_from_opts(opts, NULL, &local_err);
+    if (error_is_set(&local_err)) {
+        fprintf(stderr, "%s\n", error_get_pretty(local_err));
+        error_free(local_err);
         return -1;
+    }
     return 0;
 }