drm/exynos: gem code cleanup

This cleans codes of exynos gem - indents and order function and so on.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c b/drivers/gpu/drm/exynos/exynos_drm_buf.c
index 2bb07bc..3cf785c 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_buf.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c
@@ -73,7 +73,7 @@
 	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 	if (!buffer) {
 		DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
-		return ERR_PTR(-ENOMEM);
+		return NULL;
 	}
 
 	buffer->size = size;
@@ -84,8 +84,7 @@
 	 */
 	if (lowlevel_buffer_allocate(dev, buffer) < 0) {
 		kfree(buffer);
-		buffer = NULL;
-		return ERR_PTR(-ENOMEM);
+		return NULL;
 	}
 
 	return buffer;