flash-subpartition: fix spurious non-NULL check of non-NULL variable
flash-subpartition: fix spurious non-NULL check of non-NULL variable

In flash_subpart_info, part_actual can't be NULL (we bail out if so),
so this spurious check just manages to trigger warning in static
analysis.

Fixes: 8652ced003f7977e1126149b8011c184b88fe24e
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

mikey/skiboot,legoater/skiboot,qemu/skiboot,stewart-ibm/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,mikey/skiboot,legoater/skiboot,qemu/skiboot,stewart-ibm/skiboot,legoater/skiboot,qemu/skiboot,open-power/skiboot,stewart-ibm/skiboot,shenki/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,shenki/skiboot,mikey/skiboot,shenki/skiboot