add missing (empty) default for swtch; close #364

src/codegen.c

@@ -207,6 +207,8 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
           return;
         }
         break;
+      default:
+	break;
       }
       break;
     case OP_SETIV:
@@ -240,6 +242,8 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
         return;
       }
       break;
+    default:
+      break;
     }
   }
   genop(s, i);