Correctly handle a length of zero in memcpy(). Return the original destination pointer in memcpy() and memmove().
Correctly handle a length of zero in memcpy().
Return the original destination pointer in memcpy() and memmove().

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars