[BUG] git-submodule has bash-ism?

[Junio C Hamano]

relative_path ()
{
        local target curdir result
        target=$1
        curdir=${2-$wt_prefix}

I am hoping that Stefan's "gradually rewrite things in C" will make
it unnecessary to worry about this one.  "git submodule" would not
work correctly on posixly correct shells in the meantime.

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