Variable rval is set to QLA_SUCCESS but this value is never read as it is
overwritten later on. Hence it is a redundant assignment and can be
removed.

Clean up the following clang-analyzer warning:

drivers/scsi/qla2xxx/qla_init.c:4359:2: warning: Value stored to 'rval'
is never read [clang-analyzer-deadcode.DeadStores].

Link: https://lore.kernel.org/r/1620643206-127930-1-git-send-email-jiapeng.chong@linux.alibaba.comReported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>