bnx2i: Fixed firmware assert, during target logout.

Fix the firmware assert, during target logout in
case driver received FIN from target before waiting for
asyncronous response.

Signed-off-by: Tej Parkash <tej.parkash@qlogic.com>
Signed-off-by: Nilesh Javali <nilesh.javali@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Odin.com>