git plugin: make b local in gg* functions because it leaked, and led to #3991
git plugin: make b local in gg* functions
because it leaked, and led to #3991

tekniklr/oh-my-zsh,FrankSansC/oh-my-zsh,nunogt/oh-my-zsh,lightmanhk/oh-my-zsh,lightmanhk/oh-my-zsh,tekniklr/oh-my-zsh,FrankSansC/oh-my-zsh,lightmanhk/oh-my-zsh,lightmanhk/oh-my-zsh,FrankSansC/oh-my-zsh,nunogt/oh-my-zsh,FrankSansC/oh-my-zsh