[S] Change in flashrom[master]: dummyflasher: use new API to register shutdown function

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Edward O'Callaghan, Alexander Goncharov.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/72408 )

Change subject: dummyflasher: use new API to register shutdown function
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Patch Set 2:

(1 comment)

File dummyflasher.c:

https://review.coreboot.org/c/flashrom/+/72408/comment/55b16e3f_7cb702b1 
PS2, Line 1416: data->refs_cnt += ((dummy_buses_supported & BUS_PROG) != BUS_NONE);
              : 	data->refs_cnt += ((dummy_buses_supported & BUS_NONSPI) != BUS_NONE);
              : 	data->refs_cnt += ((dummy_buses_supported & BUS_SPI) != BUS_NONE);
              : 
              : #if 0
              : 	data->refs_cnt += (dummy_buses_supported & BUS_PROG) ? 1 : 0;
              : 	data->refs_cnt += (dummy_buses_supported & BUS_NONSPI) ? 1 : 0;
              : 	data->refs_cnt += (dummy_buses_supported & BUS_SPI) ? 1 : 0;
              : #endif
> Okay, I understand, thanks for explanation! […]

Another thing could be to add `&& !ret` to every condition. Because even if one register fails -> init fails -> no need to try register remaining masters?