Harald Anlauf 6ce3d791df PR fortran/95104 - Segfault on a legal WAIT statement
The initial commit for this PR uncovered a latent issue with unit locking
in the Fortran run-time library.  Add check for valid unit.

2020-05-28  Harald Anlauf  <anlauf@gmx.de>

libgfortran/
	PR libfortran/95104
	* io/unit.c (unlock_unit): Guard by check for NULL pointer.
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