fix a braino in legitimize_path()

brown paperbag time... wrong order of arguments ended up confusing
the values to check dentry and mount_lock seqcounts against.
Reported-by: kernel test robot <rong.a.chen@intel.com>
Fixes: 2aa38470 ("non-RCU analogue of the previous commit")
Tested-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/namei.c

@@ -610,7 +610,7 @@ static bool __legitimize_path(struct path *path, unsigned seq, unsigned mseq)
 static inline bool legitimize_path(struct nameidata *nd,
 			    struct path *path, unsigned seq)
 {
-	return __legitimize_path(path, nd->m_seq, seq);
+	return __legitimize_path(path, seq, nd->m_seq);
 }
 
 static bool legitimize_links(struct nameidata *nd)