[PATCH, libgfortran] Fix for PR25109

[Jerry DeLisle]

The attached patch fixes this PR.  We were setting the default BLANK=behavior to 
UNSPECIFIED when it should have been "NULL"

Regression tested and NIST tested:

Could be considered obvious.  I will wait to commit until tomorrow.  I don't 
know how to do a test case for reading stdin.  I did test with the examples in 
the pr.

2205-11-26  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/25109
	* io/unit.c (init_units): Set default flag to BLANK_NULL per
	requirement of F95 standard.  Set PAD_YES for stdin.
	(get_unit): Set PAD_YES for internal units.

Regards,

Jerry
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