ocfs2: remove duplicate definition in xattr

Include/linux/xattr.h already has the definition about xattr prefix,
so remove the duplicate definitions in xattr.c.
Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

fs/ocfs2/xattr.c

@@ -4740,14 +4740,11 @@ static int ocfs2_delete_xattr_index_block(struct inode *inode,
 /*
  * 'trusted' attributes support
  */
-
-#define XATTR_TRUSTED_PREFIX "trusted."
-
 static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
 				       size_t list_size, const char *name,
 				       size_t name_len)
 {
-	const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
+	const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
 	const size_t total_len = prefix_len + name_len + 1;
 
 	if (list && total_len <= list_size) {
@@ -4784,18 +4781,14 @@ struct xattr_handler ocfs2_xattr_trusted_handler = {
 	.set	= ocfs2_xattr_trusted_set,
 };
 
-
 /*
  * 'user' attributes support
  */
-
-#define XATTR_USER_PREFIX "user."
-
 static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
 				    size_t list_size, const char *name,
 				    size_t name_len)
 {
-	const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
+	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
 	const size_t total_len = prefix_len + name_len + 1;
 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);