[PATCH v2] branch: segfault fixes and validation

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 we bail out when the user gives 2 or more arguments, but we only process the first one and silently ignore the rest.

Re: [PATCH v2] branch: segfault fixes and validation

Nguyễn Thái Ngọc Duy pclo...@gmail.com writes: 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 we bail out when the user gives 2 or more arguments, but we only process the