Change in flashrom[master]: opaque_master: Use new API to register shutdown function

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Nico Huber, Edward O'Callaghan, Angel Pons.
Hello build bot (Jenkins), Nico Huber, Edward O'Callaghan, Angel Pons,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/56825

to look at the new patch set (#2).

Change subject: opaque_master: Use new API to register shutdown function
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opaque_master: Use new API to register shutdown function

This allows opaque masters to register shutdown function in
opaque_master struct, which means there is no need to call
register_shutdown in init function, since this call is now a part
of register_opaque_master.

As a consequence of using new API, two things are happening here:
1) No resource leakage anymore in case register_shutdown() would fail,
2) Fixed propagation of register_opaque_master() return values.

BUG=b:185191942
TEST=1) builds and ninja test including CB:56413
2) on ARMv7 device
flashrom -p linux_mtd -V
-> using linux_mtd, chip found

Change-Id: Id8471a117556edcbf9694752fabe05cf4501ce70
Signed-off-by: Anastasia Klimchuk 
---
M linux_mtd.c
M nicintel_eeprom.c
2 files changed, 5 insertions(+), 15 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/25/56825/2