[S] Change in flashrom[master]: programmer.h: Guard against sending spi commands on non-spi mst

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Felix Singer, Angel Pons.

Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/71269 )

Change subject: programmer.h: Guard against sending spi commands on non-spi mst
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Patch Set 2:

(1 comment)

File flashrom.c:

https://review.coreboot.org/c/flashrom/+/71269/comment/79edb5d5_14e8c830 
PS1, Line 1937: spi_master_no_4ba_modes
> Wouldn't it make more sense to add the bustype check inside this function?

sort of but not really. This is a chip bustype check not a master bustype check.

Adding a predicate to `spi_master_no_4ba_modes()` is not related to preventing the subsequent calls to `spi_{enter,exit}_4ba()`.

I think what you are asking for is a `spi_chip_4ba()` func which I have now done?