scsi: qla2xxx: Fix abort timeout race condition.

If an abort times out, the Abort IOCB completion and Abort timer can race
against each other. This patch provides unique error code for timer path to
allow proper cleanup.

[mkp: typo]

Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>