scsi: qla2xxx: Remove redundant variable initialization

The initialization value of `rc` is wrong. It is unnecessary to initialize
`rc` variables, so remove its initialization operation.

Link: https://lore.kernel.org/r/20200802111527.4928-1-tianjia.zhang@linux.alibaba.com


Fixes: 84905dfe ("scsi: qla2xxx: Fix TMF and Multi-Queue config")
Cc: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>