Fixes the following W=1 kernel build warning(s):

 drivers/scsi/qla4xxx/ql4_nx.c: In function ‘qla4_84xx_minidump_process_rddfe’:
 drivers/scsi/qla4xxx/ql4_nx.c:2648:23: warning: variable ‘data_size’ set but not used [-Wunused-but-set-variable]
 2648 | uint32_t poll, mask, data_size, modify_mask;
 | ^~~~~~~~~
 drivers/scsi/qla4xxx/ql4_nx.c: In function ‘qla4_84xx_minidump_process_rdmdio’:
 drivers/scsi/qla4xxx/ql4_nx.c:2745:11: warning: variable ‘poll’ set but not used [-Wunused-but-set-variable]
 2745 | uint32_t poll, mask;
 | ^~~~
 drivers/scsi/qla4xxx/ql4_nx.c: In function ‘qla4_84xx_minidump_process_pollwr’:
 drivers/scsi/qla4xxx/ql4_nx.c:2816:47: warning: variable ‘mask’ set but not used [-Wunused-but-set-variable]
 2816 | uint32_t addr1, addr2, value1, value2, poll, mask, r_value;
 | ^~~~

Link: https://lore.kernel.org/r/20200721164148.2617584-33-lee.jones@linaro.org
Cc: QLogic-Storage-Upstream@qlogic.com
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>