getdef: avoid spurious error messages about unknown configuration opt… #976
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…ions
def_find can return NULL for unset, not just unknown, config options. So move the decision of whether to log an error message about an unknown config option back into def_find, which knows the difference. Only putdef_str() will pass a char* srcfile to def_find, so only calls from putdef_str will cause the message, which was the original intent of fa68441.
closes #967
fixes: fa68441 ("Improve the login.defs unknown item error message")