fix: src\hash.c(139): warning C4244: 'function': conversion from 'mrb_int' to...

fix: src\hash.c(139): warning C4244: 'function': conversion from 'mrb_int' to 'khint_t', possible loss of data

src/hash.c

@@ -136,7 +136,7 @@ mrb_hash_new_capa(mrb_state *mrb, mrb_int capa)
 
   h = (struct RHash*)mrb_obj_alloc(mrb, MRB_TT_HASH, mrb->hash_class);
   /* khash needs 1/4 empty space so it is not resized immediately */
-  h->ht = kh_init_size(ht, mrb, capa*4/3);
+  h->ht = kh_init_size(ht, mrb, (khint_t)(capa*4/3));
   h->iv = 0;
   return mrb_obj_value(h);
 }