randr: fix user mode create initial reference count

Don't need extra reference count adding when creating user mode.
This fixes user mode destroy, otherwise we get BadAccess error.

randr/rrmode.c

@@ -85,11 +85,6 @@ RRModeCreate (xRRModeInfo   *modeInfo,
 	return NULL;
     modes = newModes;
     modes[num_modes++] = mode;
-    
-    /*
-     * give the caller a reference to this mode
-     */
-    ++mode->refcnt;
     return mode;
 }