Fix Fragmenter with user fields

src/main/scala/tilelink/Fragmenter.scala

@@ -313,7 +313,7 @@ class TLFragmenter(val minSize: Int, val maxSize: Int, val alwaysMin: Boolean =
         val fullMask = ((BigInt(1) << beatBytes) - 1).U
         assert (!repeater.io.full || in_a.bits.mask === fullMask)
         out.a.bits.mask := Mux(repeater.io.full, fullMask, in.a.bits.mask)
-        out.a.bits.user :<= in.a.bits.user.subset(_.isData)
+        out.a.bits.user.waiveAll :<= in.a.bits.user.subset(_.isData)
 
         // Tie off unused channels
         in.b.valid := false.B