git.sh cleanup: git am handling (remove patchfail)

the patchfail variable was only needed in the old design,
where git am was being handled inside a subshell, and
also when we did it directly in the target directory
without using a temporary directory. with the current
design, we can just call err() and ditch the tmp repo

Signed-off-by: Leah Rowe <leah@libreboot.org>

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