redundunt require

[DecodeTheEncoded]

https://github.com/chipsalliance/rocket-chip/blob/66a60e55a18fae859730b01c04450b2da3630e19/src/main/scala/tilelink/Fragmenter.scala#L93 This loc should be removed, because the following loc 97 seems already includes this require condition：

https://github.com/chipsalliance/rocket-chip/blob/66a60e55a18fae859730b01c04450b2da3630e19/src/main/scala/tilelink/Fragmenter.scala#L97 @hcook @terpstra