xstring_cstr_split bug: segfault on split odd number

[Thecarisma]

Fails

xstring_cstr_split("One|Two|Three", "|", cline_arg->allocator)

Pass

xstring_cstr_split("One|Two", "|", cline_arg->allocator)
xstring_cstr_split("One|Two|Three|Four", "|", cline_arg->allocator)