f2fs: introduce f2fs_dentry_kunmap to clean up

This patch introduces f2fs_dentry_kunmap to clean up dirty codes.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 4b180bb..9a93a6e 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -129,8 +129,7 @@
 	goto out;
 
 out_unmap_put:
-	if (!f2fs_has_inline_dentry(dir))
-		kunmap(page);
+	f2fs_dentry_kunmap(dir, page);
 	f2fs_put_page(page, 0);
 out_err:
 	iput(dir);