scsi: qedf: Remove redundant initialization of variable rc

The variable rc is being initialized with a value that is never read and it
is being updated later with a new value.  The initialization is redundant
and can be removed.

Link: https://lore.kernel.org/r/20200527115242.172344-1-colin.king@canonical.com


Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>