re PR fortran/65089 (FAIL: gfortran.dg/io_real_boz(2|_[45]).f90 when tested with -fsanitize=address)

2015-04-14 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.

From-SVN: r222111