Remove redundant type-check
since mrb_str_to_str() also does it.
MODIFY
src/string.c
src/string.c
@@ -1963,9 +1963,6 @@ mrb_str_intern(mrb_state *mrb, mrb_value self)
MRB_API mrb_value
mrb_obj_as_string(mrb_state *mrb, mrb_value obj)
{
- if (mrb_string_p(obj)) {
- return obj;
- }
return mrb_str_to_str(mrb, obj);
}

Remove redundant type-check

since mrb_str_to_str() also does it.