[PATCH, fortran] Fix numerous ICEs in IO statements with IOMSG

[Steve Kargl]

The attached patch fixes numerous ICE's where a program
writed invalid code (see testcase).  Regression tested
on i386-*-freebsd.  OK to commit?

2015-07-05  Steven G. Kargl  <kargl@gcc.gnu.org>

	* io.c (check_char_variable): New function.
	(match_open_element, match_close_element, match_file_element,
	match_dt_element, match_inquire_element, match_wait_element): Use it.


2015-07-05  Steven G. Kargl  <kargl@gcc.gnu.org>

	* gfortran.dg/iomsg_2.f90: New test.

-- 
Steve
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