[gtk-vnc] examples: default hostname to "localhost" if not specified

[Daniel P. Berrange <dberrange src gnome org>]

commit 59cb306c687c03f96533024456722e32d11cbac1
Author: Daniel P. Berrangé <dan berrange com>
Date:   Thu Apr 1 18:37:20 2021 +0100

    examples: default hostname to "localhost" if not specified
    
    Signed-off-by: Daniel P. Berrangé <berrange redhat com>

 examples/gvncviewer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/examples/gvncviewer.c b/examples/gvncviewer.c
index d7d2ad8..50e111f 100644
--- a/examples/gvncviewer.c
+++ b/examples/gvncviewer.c
@@ -878,7 +878,7 @@ int main(int argc, char **argv)
         } else {
             port = g_strdup("5900");
         }
-        vnc_display_open_host(VNC_DISPLAY(vnc), hostname, port);
+        vnc_display_open_host(VNC_DISPLAY(vnc), *hostname ? hostname : "localhost", port);
         g_free(hostname);
         g_free(port);
 #ifdef HAVE_GIOUNIX