scsi: aha1542: Kill trailing whitespace

Some source lines (mostly the comments) in this driver end with spaces, as
reported by 'scripts/checkpatch.pl'. Trim these lines.

Link: https://lore.kernel.org/r/59829052-4932-4ea3-b504-857bbb19e6a0@omprussia.ru
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>