scsi: qedi: remove set but not used variables 'cdev' and 'udev'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/scsi/qedi/qedi_iscsi.c: In function 'qedi_ep_connect':
drivers/scsi/qedi/qedi_iscsi.c:813:23: warning: variable 'udev' set but not used [-Wunused-but-set-variable]
drivers/scsi/qedi/qedi_iscsi.c:812:18: warning: variable 'cdev' set but not used [-Wunused-but-set-variable]

These have never been used since introduction.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Manish Rangankar <mrangankar@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>