Merge branch 'master' into v2.1

src/lj_err.c

@@ -150,6 +150,7 @@ static void *err_unwind(lua_State *L, void *stopcf, int errcode)
     case FRAME_CONT:  /* Continuation frame. */
       if (frame_iscont_fficb(frame))
 	goto unwind_c;
+      /* fallthrough */
     case FRAME_VARG:  /* Vararg frame. */
       frame = frame_prevd(frame);
       break;