alloc_path_pseudo(): make sure we don't end up with NORCU dentries for directories

A lot of places relies upon directories never having NORCU dentries;
currently that property holds, but the proof is not straightforward
and rather brittle.

It's better to have that verified in the sole caller of d_alloc_pseudo(),
so that any future bugs in that direction were caught early.

That way we can be sure that
	* current directory of any process is not NORCU
	* root directory of any process is not NORCU
	* starting point of any LOOKUP_RCU pathwalk is not NORCU
	* dget_parent() can rely upon ->d_parent not being NORCU
	* d_walk() and is_subdir() can rely upon the same
	* alloc_file_pseudo() won't create multiple aliases for a directory
without having to go through a convoluted audit.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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