scsi: pm8001: Fix memory leak in pm8001_chip_fw_flash_update_req()

In pm8001_chip_fw_flash_update_build(), if
pm8001_chip_fw_flash_update_build() fails, the struct fw_control_ex
allocated must be freed.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Jack Wang <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/pm8001/pm8001_hwi.c

···
 	ccb->ccb_tag = tag;
 	rc = pm8001_chip_fw_flash_update_build(pm8001_ha, &flash_update_info,
 		tag);
-	if (rc)
+	if (rc) {
+		kfree(fw_control_context);
 		pm8001_tag_free(pm8001_ha, tag);
+	}
 
 	return rc;
 }