Change in flashrom[master]: programmer.h: Convert anon union to anon struct

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Stefan Reinauer, Edward O'Callaghan.
Hello Sam McNally, Alan Green, build bot (Jenkins), Stefan Reinauer, Angel Pons, 

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

    https://review.coreboot.org/c/flashrom/+/50246

to look at the new patch set (#3).

Change subject: programmer.h: Convert anon union to anon struct
......................................................................

programmer.h: Convert anon union to anon struct

Convert the anon union of registered masters in the mst
field of the flashctx to a anon struct. If we are going
to dereference a pointer there in an undefined way we
should crash and not plow ahead with invalid memory.

The user of the registered_masters type is therefore
responsible for querying the buses_supported field before
attempting to dereference a ptr field in the anon struct.

BUG=none
TEST=`flashrom -p internal --flash-name`

Change-Id: I576967a8599b923c902e39f177f39146291cc242
Signed-off-by: Edward O'Callaghan <[e-mail]>
---
M opaque.c
M programmer.c
M programmer.h
M spi.c
4 files changed, 5 insertions(+), 4 deletions(-)


  git pull ssh://review.coreboot.org:29418/flashrom refs/changes/46/50246/3
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Gerrit-Project: flashrom
Gerrit-Branch: master
Gerrit-Change-Id: I576967a8599b923c902e39f177f39146291cc242
Gerrit-Change-Number: 50246
Gerrit-PatchSet: 3
Gerrit-Owner: Edward O'Callaghan <[e-mail]>
Gerrit-Reviewer: Alan Green <[e-mail]>
Gerrit-Reviewer: Angel Pons <[e-mail]>
Gerrit-Reviewer: Sam McNally <[e-mail]>
Gerrit-Reviewer: Stefan Reinauer <[e-mail]>
Gerrit-Reviewer: build bot (Jenkins) <[e-mail]>
Gerrit-Attention: Stefan Reinauer <[e-mail]>
Gerrit-Attention: Edward O'Callaghan <[e-mail]>
Gerrit-MessageType: newpatchset