staging: erofs: fix dummy functions erofs_{get, list}xattr

dummy functions erofs_{get,list}xattr should be inlined
without xattr enabled.
Signed-off-by: Yue Hu <zbestahu@gmail.com>
[ Gao Xiang : this patch was "staging: erofs: remove needless
              dummy functions of erofs_{get,list}xattr. "]
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190731155752.210602-4-gaoxiang25@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/xattr.h

@@ -39,6 +39,7 @@ static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi,
 	return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
 }
 
+#ifdef CONFIG_EROFS_FS_XATTR
 extern const struct xattr_handler erofs_xattr_user_handler;
 extern const struct xattr_handler erofs_xattr_trusted_handler;
 #ifdef CONFIG_EROFS_FS_SECURITY
@@ -64,25 +65,24 @@ static const struct xattr_handler *xattr_handler_map[] = {
 		xattr_handler_map[idx] : NULL;
 }
 
-#ifdef CONFIG_EROFS_FS_XATTR
 extern const struct xattr_handler *erofs_xattr_handlers[];
 
 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
 #else
-static int __maybe_unused erofs_getxattr(struct inode *inode, int index,
-	const char *name,
-	void *buffer, size_t buffer_size)
+static inline int erofs_getxattr(struct inode *inode, int index,
+				 const char *name, void *buffer,
+				 size_t buffer_size)
 {
 	return -ENOTSUPP;
 }
 
-static ssize_t __maybe_unused erofs_listxattr(struct dentry *dentry,
-	char *buffer, size_t buffer_size)
+static inline ssize_t erofs_listxattr(struct dentry *dentry,
+				      char *buffer, size_t buffer_size)
 {
 	return -ENOTSUPP;
 }
-#endif
+#endif	/* !CONFIG_EROFS_FS_XATTR */
 
 #ifdef CONFIG_EROFS_FS_POSIX_ACL
 struct posix_acl *erofs_get_acl(struct inode *inode, int type);