(!1788) xfree86: sfbmodule: use explicit field initializers for XF86ModuleData

Even though the order of these fields shouldn't change anytime
soon, it's still better programming style to name'em explicitly.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

hw/xfree86/shadowfb/sfbmodule.c

@@ -17,4 +17,6 @@ static XF86ModuleVersionInfo VersRec = {
     {0, 0, 0, 0}                /* signature, to be patched into the file by a tool */
 };
 
-_X_EXPORT XF86ModuleData shadowfbModuleData = { &VersRec, NULL, NULL };
+_X_EXPORT XF86ModuleData shadowfbModuleData = {
+    .vers = &VersRec
+};