[patch, fortran] PR69110 ICE with NEWUNIT

[Jerry DeLisle]

This patch from Steve on c.l.f

Fixes the segfault from attempting a string compare where there is no string yet.

Regression tested on x86-64.  New test case.

OK for trunk.

Regards,

Jerry

2016-02-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
	    Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/69110
	* io.c (gfc_match_open): Check that open status is an expression
	constant before comparing string to 'scratch' with NEWUNIT.
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