[patch, libgfortran] PR65089 FAIL: gfortran.dg/io_real_boz(2|_[45]).f90 when tested with -fsanitize=address

[Jerry DeLisle]

Hi all,

The attached patch fixes this bug.  It also eliminates non-freed memory whenever
a format error occurs.  Particular important when the user has use IOSTAT and 
generate_error does not exit, but returns to continue program execution.

Regression tested on x86-64 and tested with -fsanitize=address and valgrind on a 
number of existing test cases.  Changelog is fairly clear I think.

OK for trunk?

Regards,

Jerry

2015-04-12 Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR libgfortran/65089
	* io/format.h (free_format): New function to free memory
	allocated for building format error messages.
	* io/format.c (format_error): Add checks before freeing memory
	to avoid potential segfaults and free formatting data when
	needed on error conditions. Always allocate and NULL terminate
	the string.
	* io/transfer.c (st_read_done, st_write_done): Use new
	free_format function to clean up memory allocations when done.
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