qmp: unbreak build for non-vnc configuration

Signed-off-by: Leon Yu <chianglungyu@gmail.com>
Message-id: 1422853731-5282-1-git-send-email-chianglungyu@gmail.com
Fixes: df887684603a ("monitor: add query-vnc-servers command")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

qmp.c

@@ -134,6 +134,12 @@ VncInfo *qmp_query_vnc(Error **errp)
     error_set(errp, QERR_FEATURE_DISABLED, "vnc");
     return NULL;
 };
+
+VncInfo2List *qmp_query_vnc_servers(Error **errp)
+{
+    error_set(errp, QERR_FEATURE_DISABLED, "vnc");
+    return NULL;
+};
 #endif
 
 #ifndef CONFIG_SPICE