scsi: megaraid: Remove the static variable initialisation

Initialising global and static variables to 0 is unnecessary.  Remove the
initialisation.

Link: https://lore.kernel.org/r/20220723091620.5463-1-wangborong@cdjrlc.com


Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>