[Bug libfortran/67540] string_intrinsics_inc.c sanitizer detects null pointer passed to memcpy

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67540

--- Comment #11 from Vittorio Zecca <zeccav at gmail dot com> ---
Actually, the null pointer str4 is dereferenced four times:
at lines 39, 40, 68, 69.