Change in flashrom[master]: jlink_spi.c: Separate shutdown from failed init cleanup

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Edward O'Callaghan, Angel Pons.
Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/52308 )

Change subject: jlink_spi.c: Separate shutdown from failed init cleanup
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Patch Set 2:

(1 comment)

File jlink_spi.c:

https://review.coreboot.org/c/flashrom/+/52308/comment/271bf53f_86a27b21 
PS1, Line 181: init_ret
> just call this ret and default to failure, that is to say initialise with 1 instead of 0. […]

Default to failure: done. Makes sense, there are a lot of reasons for failure here.
I did not rename because there is one variable called "ret" already (line 206 in the latest patch set). Renaming would produce lots of diffs, maybe I will do this later (not in this patch)?