please, remove the abuse of vfs_path_lookup() in ecryptfs

[Al Viro]

	commit 21edad32205e97dc7ccb81a85234c77e760364c8 (
ecryptfs: dont call lookup_one_len to avoid NULL nameidata) is badly
misguided.  The last thing we need is extra places where nameidata is
passed around.

	The current code is simply wrong - it's bypassing dcache
lookups in new_lower_dentry().  Besides, abuse of vfs_path_lookup()
here is a Bad Idea(tm).  No, filesystems are *not* allowed to die
if ->d_revalidate()/->lookup()/->create() are called with NULL
nameidata.  Eventually these methods will lose nameidata * anyway -
starting with ->d_revalidate() in the next cycle at the latest
(i.e. if we run into something really stinky in RCU mess, it might
happen before -final).

	Please revert that.
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