Merge "Always close file descriptors" into pi-dev

        final String errPrefix = "Error in NetlinkSocket.sendOneShotKernelMessage";

        final long IO_TIMEOUT = 300L;

        FileDescriptor fd;

        final FileDescriptor fd = forProto(nlProto);

        try {

            fd = forProto(nlProto);

            connectToKernel(fd);

            sendMessage(fd, msg, 0, msg.length, IO_TIMEOUT);

            final ByteBuffer bytes = recvMessage(fd, DEFAULT_RECV_BUFSIZE, IO_TIMEOUT);

        } catch (SocketException e) {

            Log.e(TAG, errPrefix, e);

            throw new ErrnoException(errPrefix, EIO, e);

        }

        } finally {

            IoUtils.closeQuietly(fd);

        }

    }

    public static FileDescriptor forProto(int nlProto) throws ErrnoException {

        final FileDescriptor fd = Os.socket(AF_NETLINK, SOCK_DGRAM, nlProto);