Re: [PATCH/RFH] pp_header(): work around possible memory corruption

At least the older humongous pretty_print_commit() got separated
into manageable chunks, and I was happy.  I was just too lazy
when refactoring the code and stopped there.

The right fix is to propagate the "realloc as needed" callchain
into add_user_info(), instead of having "this should be enough"
there.  These two you touched are the only two callsite of that
static function.