[patch, fortran] PR35724 compile time segmentation fault for eoshift

[Jerry DeLisle]

This patch fixes the same problem we had with cshift.

Regression tested on x86-64.

Will commit as obvious.

Jerry

2008-04-16  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/35724
	* iresolve.c (gfc_resolve_eoshift): Check for NULL symtree in test for
	optional argument attribute.
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