Fix misleading indentation in gcc/fortran/io.c

Fix misleading indentation in gcc/fortran/io.c

Fix this warning:
../../../src/gcc/fortran/io.c: In function ‘match gfc_match_open()’:
../../../src/gcc/fortran/io.c:2003:4: error: statement is indented as if it were guarded by... [-Werror=misleading-indentation]
    if (!compare_to_allowed_values ("DELIM", delim, NULL, NULL,
    ^
../../../src/gcc/fortran/io.c:2000:2: note: ...this ‘if’ clause, but it is not
  if (!is_char_type ("DELIM", open->delim))
  ^

gcc/fortran/ChangeLog:
	* io.c (gfc_match_open): Fix indentation.

From-SVN: r231519