[SCSI] FlashPoint: fix off by one tests

The check on MAX_SCSI_TAR should be >= instead of > or we could go past the
end of the array.

Joe Eykholt aslo correctly points out that the check on MAX_LUN should be
>= as well.  That matches with how it is used in the rest of the file.

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