[PATCH] PCI: PCI/libata INTx bug fix

Previous INTx cleanup patch had a bug that was not caught.  I found
this last night during testing and can confirm that it is now 100%
working.

Signed-off-by: Brett Russ <russb@emc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>