drm/i915: static inline for dummy crc functions

Also use #ifdef to keep consistent with all other such cases.

Cc: Damien Lespiau <damien.lespiau@intel.com>
Acked-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -2235,10 +2235,10 @@ int i915_verify_lists(struct drm_device *dev);
 /* i915_debugfs.c */
 int i915_debugfs_init(struct drm_minor *minor);
 void i915_debugfs_cleanup(struct drm_minor *minor);
-#if defined(CONFIG_DEBUG_FS)
+#ifdef CONFIG_DEBUG_FS
 void intel_display_crc_init(struct drm_device *dev);
 #else
-void intel_display_crc_init(struct drm_device *dev) {}
+static inline void intel_display_crc_init(struct drm_device *dev) {}
 #endif
 
 /* i915_gpu_error.c */

drivers/gpu/drm/i915/i915_irq.c

@@ -1225,7 +1225,7 @@ static void ivb_pipe_crc_update(struct drm_device *dev, enum pipe pipe)
 	wake_up_interruptible(&pipe_crc->wq);
 }
 #else
-static void ivb_pipe_crc_update(struct drm_device *dev, int pipe) {}
+static inline void ivb_pipe_crc_update(struct drm_device *dev, int pipe) {}
 #endif
 
 /* The RPS events need forcewake, so we add them to a work queue and mask their