scsi: pm8001: Fix memory leak in pm8001_chip_fw_flash_update_req()

scsi: pm8001: Fix memory leak in pm8001_chip_fw_flash_update_req()

BugLink: https://bugs.launchpad.net/bugs/1969107
[ Upstream commit f792a3629f4c4aa4c3703d66b43ce1edcc3ec09a ]

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/20220220031810.738362-23-damien.lemoal@opensource.wdc.com
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit e5ecdb01952f230921aa8163d8d7f4c97c925ed8)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>