tcltklib.c: missing break [ci skip]

* ext/tk/tcltklib.c (set_max_block_time): fix missing break.
  TclTkLib.set_max_block_time(1) works but
  TclTkLib.set_max_block_time(1.0) didn't.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/tcltklib.c

@@ -1901,6 +1901,7 @@ set_max_block_time(self, time)
         divmod = rb_funcall(time, rb_intern("divmod"), 1, INT2FIX(1));
         tcl_time.sec  = NUM2LONG(RARRAY_AREF(divmod, 0));
         tcl_time.usec = (long)(NUM2DBL(RARRAY_AREF(divmod, 1)) * 1000000);
+        break;
 
     default:
         {