[PATCH -next] f2fs: xattr.h: Make stub helpers inline

[YueHaibing]

Fix gcc warnings:

In file included from fs/f2fs/dir.c:15:0:
fs/f2fs/xattr.h:157:13: warning: 'f2fs_destroy_xattr_caches' defined but not used [-Wunused-function]
 static void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { }
             ^~~~~~~~~~~~~~~~~~~~~~~~~
fs/f2fs/xattr.h:156:12: warning: 'f2fs_init_xattr_caches' defined but not used [-Wunused-function]
 static int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; }

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: a999150f4fe3 ("f2fs: use kmem_cache pool during inline xattr lookups")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 fs/f2fs/xattr.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h
index e471be77f8f0..938fcd20565d 100644
--- a/fs/f2fs/xattr.h
+++ b/fs/f2fs/xattr.h
@@ -153,8 +153,8 @@ static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
 {
 	return -EOPNOTSUPP;
 }
-static int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; }
-static void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { }
+static inline int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; }
+static inline void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { }
 #endif
 
 #ifdef CONFIG_F2FS_FS_SECURITY
-- 
2.17.1