fix va_list issue

src/eggsmclient-xsmp.c

@@ -1195,6 +1195,7 @@ array_prop (const char *name, ...)
 		pv.value = value;
 		g_array_append_val (vals, pv);
 	}
+	va_end (ap);
 
 	prop->num_vals = vals->len;
 	prop->vals = (SmPropValue *)vals->data;