Fortran: improve checking of character length specification [PR96025]

Fortran: improve checking of character length specification [PR96025]

gcc/fortran/ChangeLog:

	PR fortran/96025
	* parse.c (check_function_result_typed): Improve type check of
	specification expression for character length and return status.
	(parse_spec): Use status from above.
	* resolve.c (resolve_fntype): Prevent use of invalid specification
	expression for character length.

gcc/testsuite/ChangeLog:

	PR fortran/96025
	* gfortran.dg/pr96025.f90: New test.

(cherry picked from commit 6c1b825b3d6499dfeacf7c79dcf4b56a393ac204)