Merge "updater: Do not null terminate mount_flags_list array" am: be54337fab am: 44cea7efc8 am: ef49826256 am: d22186e4b3 am: df7e138f01

Original change: https://android-review.googlesource.com/c/platform/bootable/recovery/+/1590176

Change-Id: I7fb4ee1172bc58bf7930fef5c79443cf30a759ba