branch_get() can return NULL (so far on detached HEAD only) but some
code paths in builtin/branch.c cannot deal with that and cause
segfaults.
While at there, make sure to bail out when the user gives 2 or more
branches with --set-upstream-to or --unset-upstream, where only the
first branch is
Nguyễn Thái Ngọc Duy pclo...@gmail.com writes:
What you can do is to have a single helper function that can explain
why branch_get() returned NULL (or extend branch_get() to serve that
purpose as well); then you do not have to duplicate the logic twice
on the caller's side (and there
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