CIFS: fix error return code in cifs_atomic_open()

Fix to return a negative error code from the error handling
case instead of 0, as returned elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/dir.c

@@ -457,8 +457,10 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
 		 inode, direntry->d_name.name, direntry);
 
 	tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
-	if (IS_ERR(tlink))
+	if (IS_ERR(tlink)) {
+		rc = PTR_ERR(tlink);
 		goto out_free_xid;
+	}
 
 	tcon = tlink_tcon(tlink);
 	server = tcon->ses->server;