[Committed] PR fortran/85542 -- Avoid NULL dereference

[Steve Kargl]

I've committed the attached patch.  It checks for a valid
pointer before using it.

2018-05-11  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/85542
	* expr.c (check_inquiry): Avoid NULL pointer dereference.
 
2018-05-11  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/85542
	* gfortran.dg/pr85542.f90: New test.

-- 
Steve
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