path_init(): make -ENOTDIR failure exits consistent

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index e245d88..35195ff 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1859,7 +1859,7 @@
 	if (flags & LOOKUP_ROOT) {
 		struct inode *inode = nd->root.dentry->d_inode;
 		if (*name) {
-			if (!inode->i_op->lookup)
+			if (!can_lookup(inode))
 				return -ENOTDIR;
 			retval = inode_permission(inode, MAY_EXEC);
 			if (retval)
@@ -1913,7 +1913,7 @@
 		dentry = f.file->f_path.dentry;
 
 		if (*name) {
-			if (!S_ISDIR(dentry->d_inode->i_mode)) {
+			if (!can_lookup(dentry->d_inode)) {
 				fdput(f);
 				return -ENOTDIR;
 			}