dix: Add dixPrivatesCreated helper function

This is a preparation patch for adding prime hw-cursor support.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

dix/privates.c

@@ -783,3 +783,12 @@ dixResetPrivates(void)
         global_keys[t].allocated = 0;
     }
 }
+
+Bool
+dixPrivatesCreated(DevPrivateType type)
+{
+    if (global_keys[type].created)
+        return TRUE;
+    else
+        return FALSE;
+}

include/privates.h

@@ -252,6 +252,9 @@ dixFreeScreenSpecificPrivates(ScreenPtr pScreen);
 extern void
 dixInitScreenSpecificPrivates(ScreenPtr pScreen);
 
+/* is this private created - so hotplug can avoid crashing */
+Bool dixPrivatesCreated(DevPrivateType type);
+
 extern _X_EXPORT void *
 _dixAllocateScreenObjectWithPrivates(ScreenPtr pScreen,
                                      unsigned size,