1045: fix "void function cannot return value" in formhist

never_for_this_site(form) did return remember_form(form).
In ELinks 0.11.0, both functions returned int, so this was OK.
In commit 2b7788614f however, the
functions were changed to return void, as required by msg_box().
GCC still accepted the return statement but Sun Studio 11 did not.

src/formhist/formhist.c

@@ -358,7 +358,7 @@ never_for_this_site(void *form_)
 	struct formhist_data *form = form_;
 
 	form->dontsave = 1;
-	return remember_form(form);
+	remember_form(form);
 }
 
 unsigned char *