Introduce path_put()

* Add path_put() functions for releasing a reference to the dentry and
  vfsmount of a struct path in the right order

* Switch from path_release(nd) to path_put(&nd->path)

* Rename dput_path() to path_put_conditional()

[akpm@linux-foundation.org: fix cifs]
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 4136dfb..e13cea2 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -227,7 +227,7 @@
 
 	newmnt = afs_mntpt_do_automount(nd->path.dentry);
 	if (IS_ERR(newmnt)) {
-		path_release(nd);
+		path_put(&nd->path);
 		return (void *)newmnt;
 	}