Change in flashrom[master]: usbblaster_spi.c: Refactor singleton states into reentrant pattern

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Nico Huber, Angel Pons, Anastasia Klimchuk.
Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/54044 )

Change subject: usbblaster_spi.c: Refactor singleton states into reentrant pattern
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Patch Set 1: Code-Review+2

(1 comment)

File usbblaster_spi.c:

https://review.coreboot.org/c/flashrom/+/54044/comment/bfb66aee_114280f7 
PS1, Line 165: static int usbblaster_shutdown(void *data)
             : {
             : 	free(data);
             : 	return 0;
             : }
> My own comment on this. […]

Seems fine to me. The ftdi resource leaks any way as it is never closed so the driver actually needed a shutdown func.