drm/armada: armada_drv: Remove unused function

Remove the function armada_drm_vbl_event_remove_unlocked() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/gpu/drm/armada/armada_drm.h

@@ -46,8 +46,6 @@ void armada_drm_vbl_event_add(struct armada_crtc *,
 	struct armada_vbl_event *);
 void armada_drm_vbl_event_remove(struct armada_crtc *,
 	struct armada_vbl_event *);
-void armada_drm_vbl_event_remove_unlocked(struct armada_crtc *,
-	struct armada_vbl_event *);
 #define armada_drm_vbl_event_init(_e, _f, _d) do {	\
 	struct armada_vbl_event *__e = _e;		\
 	INIT_LIST_HEAD(&__e->node);			\

drivers/gpu/drm/armada/armada_drv.c

@@ -252,16 +252,6 @@ void armada_drm_vbl_event_remove(struct armada_crtc *dcrtc,
 	}
 }
 
-void armada_drm_vbl_event_remove_unlocked(struct armada_crtc *dcrtc,
-	struct armada_vbl_event *evt)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&dcrtc->irq_lock, flags);
-	armada_drm_vbl_event_remove(dcrtc, evt);
-	spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
-}
-
 /* These are called under the vbl_lock. */
 static int armada_drm_enable_vblank(struct drm_device *dev, int crtc)
 {