drm/exynos: Replace DRM_LOG_KMS() by DRM_DEBUG_KMS()

There are only a few users of the DRM_LOG_KMS() macro. We can simplify
the DRM code a bit by replacing them by DRM_DEBUG_KMS().

Cc: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -90,7 +90,7 @@ static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 	/* RGB formats use only one buffer */
 	buffer = exynos_drm_fb_buffer(fb, 0);
 	if (!buffer) {
-		DRM_LOG_KMS("buffer is null.\n");
+		DRM_DEBUG_KMS("buffer is null.\n");
 		return -EFAULT;
 	}
 

drivers/gpu/drm/exynos/exynos_drm_plane.c

@@ -87,7 +87,7 @@ int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
 		struct exynos_drm_gem_buf *buffer = exynos_drm_fb_buffer(fb, i);
 
 		if (!buffer) {
-			DRM_LOG_KMS("buffer is null\n");
+			DRM_DEBUG_KMS("buffer is null\n");
 			return -EFAULT;
 		}