tree c83121b9e2f7ff0db88f320e4507aec74db4e114
parent bff242f76bd641c61ecb7d8f2be68dedede237c9
author Simon Glass <sjg@chromium.org> 1402550829 -0600
committer Simon Glass <sjg@chromium.org> 1404775323 -0600

patman: Only apply patches when we know the original HEAD

When patman applies the patches it checks out a new branch, uses 'git am'
to apply the patches one by one, and then tries to go back to the old
branch. If you try this when the branch is 'undefined', this doesn't work
as patman cannot restore the correct branch after applying the patches.
It seems that 'undefined' is created by git and is persistent after it is
created, so that you can end up on quite an old branch.

Add a check for the 'undefined' branch to avoid this.

Reported-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>