[patch, fortran] PR32361 TYPE DECLARATION TO INITIALIZE DATA IN NAMED COMMON

[Jerry DeLisle]

This patch is simple, allowing the NULL to be used.

Regression tested on x86-64.

OK for trunk?  Test case will be added.

Does this need to be an extension similar to my question on pr32360?

Reporters example case:

       BLOCK DATA
        integer, pointer :: ptr1 => NULL()
        common / T / ptr1
       END

Jerry

2007-06-16  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/32361
	* match.c (gfc_match_common): If the symbol value expression type is
	NULL_EXPR, don't error if previously initialized to null.
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