[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 #9 from Vittorio Zecca <zeccav at gmail dot com> ---
This test case is wrong.
It dereferences thrice a NULL pointer str4.
Unfortunately -fcheck=pointer does not detect this one. 
Just added to the CC list the test case author.