[PATCH] hwrng: fix intel probe error unwind

The intel hwrng leaks an iomapped resource, if hwrng_register() failes.
This fixes it.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>