nommu: Provide is_vmalloc_addr() stub.

nommu: Provide is_vmalloc_addr() stub.

Introduced in commit-id 713689d9fb8e0b7ed4532074a04e4f8ff18939cd and
ifdef'ed out for nommu in ef56919c4a140c58efab178cae4745863b48195f, both
approaches end up breaking the nommu build in different ways. An
impressive feat for a 2-liner.

Current is_vmalloc_addr() users fall in to two camps:

	- Determining whether to use vfree()/kfree()
	- Whether to do vmlist traversal (only /proc/kcore).

Since we don't support /proc/kcore on nommu, that leaves the
vfree()/kfree() determination use cases. nommu vfree() happens to be a
wrapper to kfree() anyways, so is_vmalloc_addr() can always return 0
and end up with the right behaviour.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>