[S] Change in flashrom[master]: spi: Make 'default_spi_write_aai' the default unless defined

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Edward O'Callaghan.

Hello Felix Singer, build bot (Jenkins), Thomas Heijligen, Anastasia Klimchuk, Peter Marheine,

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

https://review.coreboot.org/c/flashrom/+/67479

to look at the new patch set (#4).

Change subject: spi: Make 'default_spi_write_aai' the default unless defined
......................................................................

spi: Make 'default_spi_write_aai' the default unless defined

A NULL func pointer is necessary and sufficient for the
condition `NULL func pointer => default_spi_write_aai' as to not
need this explicit specification of 'default'.

Therefore Drop the explicit need to specify the 'default_spi_write_aai'
callback function pointer in the spi_master struct. This is a reasonable default for every other driver in the tree with only a few exceptions.

This simplifies the code and driver development.

Change-Id: I7f14aaea0edcf0c08cea0e9cd27d58152707fb2a
Signed-off-by: Edward O'Callaghan 
---
M bitbang_spi.c
M buspirate_spi.c
M ch341a_spi.c
M digilent_spi.c
M dummyflasher.c
M ft2232_spi.c
M ichspi.c
M jlink_spi.c
M linux_spi.c
M mediatek_i2c_spi.c
M mstarddc_spi.c
M ni845x_spi.c
M pickit2_spi.c
M raiden_debug_spi.c
M sb600spi.c
M serprog.c
M spi.c
M stlinkv3_spi.c
M usbblaster_spi.c
19 files changed, 23 insertions(+), 24 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/79/67479/4