[SCSI] wd7000: fix reset handler typo spin_unlock_irq() => spin_lock_irq()

This was introduced back in 2005 at the very start of the git era by:
	df0ae2497ddefd72a87f3a3b34ff32455d7d4ae0
	[SCSI] allow sleeping in ->eh_host_reset_handler()

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>