drm/i915: remove "inline" keyword from ironlake_disable_display_irq

 - It's a static function
 - I just added a few more users to it
 - Its sister ironlake_enable_display_irq is not marked as inline
 - The compiler will still inline if it thinks it should do

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -101,7 +101,7 @@ ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
 	}
 }
 
-static inline void
+static void
 ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
 {
 	if ((dev_priv->irq_mask & mask) != mask) {