[yocto] Test in do_patch() fails for annotated tags

[Jeff Wang]

Commit 92c1ece6c347030d48995a36f4c67861356e59d3 causes the test in 
do_patch() in kernel-yocto.bbclass to fail if ${machine_srcrev} is an 
annotated tag. The check is meant to ensure that ${machine_srcrev} is an 
ancestor of HEAD, but if ${machine_srcrev} is a tag, then "$(git 
rev-parse --verify ${machine_srcrev})" evaluates to the SHA of the tag 
instead of what it's pointing to.

Replacing "$(git rev-parse --verify ${machine_srcrev})" with "$(git 
rev-parse --verify ${machine_srcrev}~0)" seems to fix the problem. See 
http://stackoverflow.com/a/1863712/1454667

-- 
Jeff Wang


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