xf86: use new xf86VTOwner interface in a few places

This replaces some previous uses of direct xf86Screens[0] accesses.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Dave Airlie <airlied@gmail.com>

hw/xfree86/common/xf86Events.c

@@ -427,7 +427,7 @@ xf86VTSwitch(void)
      * Since all screens are currently all in the same state it is sufficient
      * check the first.  This might change in future.
      */
-    if (xf86Screens[0]->vtSema) {
+    if (xf86VTOwner()) {
 
         DebugF("xf86VTSwitch: Leaving, xf86Exiting is %s\n",
                BOOLTOSTRING((dispatchException & DE_TERMINATE) ? TRUE : FALSE));

hw/xfree86/common/xf86Init.c

@@ -819,7 +819,7 @@ InitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
     if (serverGeneration != 1) {
         xf86Resetting = TRUE;
         /* All screens are in the same state, so just check the first */
-        if (!xf86Screens[0]->vtSema) {
+        if (!xf86VTOwner()) {
 #ifdef HAS_USL_VTS
             ioctl(xf86Info.consoleFd, VT_RELDISP, VT_ACKACQ);
 #endif

hw/xfree86/common/xf86Xinput.c

@@ -870,7 +870,7 @@ xf86NewInputDevice(InputInfoPtr pInfo, DeviceIntPtr *pdev, BOOL enable)
     }
 
     /* Enable it if it's properly initialised and we're currently in the VT */
-    if (enable && dev->inited && dev->startup && xf86Screens[0]->vtSema) {
+    if (enable && dev->inited && dev->startup && xf86VTOwner()) {
         OsBlockSignals();
         EnableDevice(dev, TRUE);
         if (!dev->enabled) {

hw/xfree86/os-support/solaris/sun_init.c

@@ -274,7 +274,7 @@ xf86OpenConsole(void)
              * this is to make sure we don't continue until the activate
              * signal is received.
              */
-            if (!xf86Screens[0]->vtSema)
+            if (!xf86VTOwner())
                 sleep(5);
         }
 #endif                          /* HAS_USL_VTS */