qemu-char: report udp backend errors

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/qemu-char.c b/qemu-char.c
index c097ca1..5a8f9c0 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2255,6 +2255,8 @@
 
     fd = inet_dgram_opts(opts, &local_err);
     if (fd < 0) {
+        qerror_report_err(local_err);
+        error_free(local_err);
         return NULL;
     }
     return qemu_chr_open_udp_fd(fd);