Clean up the logic in DoReceive

src/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets/SocketConnection.cs

@@ -84,29 +84,23 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets
                     // Ensure we have some reasonable amount of buffer space
                     var buffer = _input.Alloc(MinAllocBufferSize);
 
-                    int bytesReceived;
-
                     try
                     {
-                        bytesReceived = await _socket.ReceiveAsync(GetArraySegment(buffer.Buffer), SocketFlags.None);
+                        var bytesReceived = await _socket.ReceiveAsync(GetArraySegment(buffer.Buffer), SocketFlags.None);
-                    }
-                    catch (Exception)
-                    {
-                        buffer.Commit();
-                        throw;
-                    }
 
                         if (bytesReceived == 0)
                         {
-                        buffer.Commit();
-
                             // We receive a FIN so throw an exception so that we cancel the input
                             // with an error
                             throw new TaskCanceledException("The request was aborted");
                         }
 
-                    // Record what data we filled into the buffer and push to pipe
                         buffer.Advance(bytesReceived);
+                    }
+                    finally
+                    {
+                        buffer.Commit();
+                    }
 
                     var result = await buffer.FlushAsync();
                     if (result.IsCompleted)