[PATCH, committed] Fix PR fortran/80752

[Steve Kargl]

I've committed the attached patch.

2017-05-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/80752
	* expr.c (gfc_generate_initializer):  If type conversion fails,
	check for error and return NULL.

2017-05-15  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/80752
	gfortran.dg/pr80752.f90: New test.

-- 
Steve
20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4
20161221 https://www.youtube.com/watch?v=IbCHE-hONow
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