ipa-prop: Fix ipa_get_callee_param_type for calls with argument type mismatches

ipa-prop: Fix ipa_get_callee_param_type for calls with argument type mismatches

The PR contains a testcase where the Fortran FE creates FUNCTION_TYPE
which doesn't really match the passed in arguments (FUNCTION_TYPE has
5 arguments, call has 6).  Now, I think that is a Fortran FE bug that
should be fixed there, but I think with function pointers one can
create something similar (of course invalid) in C/C++ too,so IMHO IPA
should be also more careful.
The ipa_get_callee_param_type function can return NULL if something goes
wrong and it does e.g. if asked for 7th argument type on a function
with just 5 arguments and similar.  But, if a function isn't varargs,
when asked for 6th argument type on a function with just 5 arguments
it actually returns void_type_node because the argument list is in that
case terminated with void_list_node.

The following patch makes sure we don't treat void_list_node as something
holding another argument.

2023-05-10  Jakub Jelinek  <jakub@redhat.com>

	PR fortran/109788
	* ipa-prop.cc (ipa_get_callee_param_type): Don't return TREE_VALUE (t)
	if t is void_list_node.