- remove always-true test

- neaten request_irq() indentation

This change's main purpose is to prepare for the patchset in
jgarzik/misc-2.6.git#irq-remove, that explores removal of the
never-used 'irq' argument in each interrupt handler.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>