Remove TODO in channels

Author: qwwdfsad

common/kotlinx-coroutines-core-common/src/channels/Channel.kt

@@ -397,6 +397,7 @@ public class ClosedSendChannelException(message: String?) : CancellationExceptio
  * Indicates attempt to [receive][ReceiveChannel.receive] on [isClosedForReceive][ReceiveChannel.isClosedForReceive]
  * channel that was closed without a cause. A _failed_ channel rethrows the original [close][SendChannel.close] cause
  * exception on receive attempts.
+ *
+ * This exception is subclass of [NoSuchElementException] to be consistent with plain collections.
  */
-// todo: explain when this exception is thrown
 public class ClosedReceiveChannelException(message: String?) : NoSuchElementException(message)

common/kotlinx-coroutines-core-common/src/channels/ConflatedChannel.kt

@@ -43,7 +43,6 @@ internal open class ConflatedChannel<E> : AbstractChannel<E>() {
                     when (sendResult) {
                         null -> return OFFER_SUCCESS
                         is Closed<*> -> return sendResult
-                        else -> Unit // todo:KLUDGE: works around native BE bug
                     }
                     // otherwise there was receiver in queue, retry super.offerInternal
                 }

common/kotlinx-coroutines-core-common/src/channels/LinkedListChannel.kt

@@ -33,7 +33,6 @@ internal open class LinkedListChannel<E> : AbstractChannel<E>() {
                     when (sendResult) {
                         null -> return OFFER_SUCCESS
                         is Closed<*> -> return sendResult
-                        else -> Unit // todo:KLUDGE: works around native BE bug
                     }
                     // otherwise there was receiver in queue, retry super.offerInternal
                 }