Change range_check before mrb_obj_alloc.

src/range.c

@@ -38,8 +38,8 @@ mrb_range_new(mrb_state *mrb, mrb_value beg, mrb_value end, mrb_bool excl)
 {
   struct RRange *r;
 
-  r = (struct RRange*)mrb_obj_alloc(mrb, MRB_TT_RANGE, RANGE_CLASS);
   range_check(mrb, beg, end);
+  r = (struct RRange*)mrb_obj_alloc(mrb, MRB_TT_RANGE, RANGE_CLASS);
   r->edges = (mrb_range_edges *)mrb_malloc(mrb, sizeof(mrb_range_edges));
   r->edges->beg = beg;
   r->edges->end = end;