f2fs: introduce f2fs_has_inline_xattr for better readability

This patch introduces a help function f2fs_has_inline_xattr for better
readability.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 33c448e..c0fae3e 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1500,7 +1500,7 @@
 	struct page *ipage;
 	struct f2fs_inode *ri;
 
-	if (!is_inode_flag_set(F2FS_I(inode), FI_INLINE_XATTR))
+	if (!f2fs_has_inline_xattr(inode))
 		return;
 
 	if (!IS_INODE(page))