Fix byte channel constructor from an array

Author: Sergey Mashkov

kotlinx-coroutines-io/kotlinx-coroutines-io-js/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelJS.kt

@@ -32,7 +32,7 @@ actual fun ByteReadChannel(content: ByteArray, offset: Int, length: Int): ByteRe
         tail = IoBuffer.Pool.borrow()
     }
 
-    return ByteChannelJS(head, false)
+    return ByteChannelJS(head, false).apply { close() }
 }
 
 /**
@@ -56,7 +56,7 @@ fun ByteReadChannel(content: ArrayBufferView): ByteReadChannel {
         tail = IoBuffer.Pool.borrow()
     }
 
-    return ByteChannelJS(head, false)
+    return ByteChannelJS(head, false).apply { close() }
 }
 
 actual suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean) {

kotlinx-coroutines-io/kotlinx-coroutines-io-native/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelNative.kt

@@ -33,7 +33,7 @@ actual fun ByteReadChannel(content: ByteArray, offset: Int, length: Int): ByteRe
         tail = IoBuffer.Pool.borrow()
     }
 
-    return ByteChannelNative(head, false)
+    return ByteChannelNative(head, false).apply { close() }
 }
 
 actual suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean) {
@@ -64,7 +64,6 @@ internal class ByteChannelNative(initial: IoBuffer, autoFlush: Boolean) : ByteCh
         }
     }
 
-
     override suspend fun readAvailable(dst: CPointer<ByteVar>, offset: Int, length: Int): Int {
         return readAvailable(dst, offset.toLong(), length.toLong())
     }

kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteChannelSmokeTest.kt

@@ -639,6 +639,14 @@ open class ByteChannelSmokeTest : ByteChannelTestBase() {
         }
     }
 
+    @Test
+    fun testConstruct() = runTest {
+        val channel = ByteReadChannel(ByteArray(2))
+        channel.readRemaining().use { rem ->
+            rem.discardExact(2)
+        }
+    }
+
     private fun assertEquals(expected: Float, actual: Float) {
         if (abs(expected - actual) > 0.000001f) {
             kotlin.test.assertEquals(expected, actual)