staging: fwserial: Remove repeated word and

Remove unnecessary repeated word and

Signed-off-by: Abheek Dhawan <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/fwserial/fwserial.c

···
  * fwtty_do_hangup - wait for ldisc to deliver all pending rx; only then hangup
  *
  * When the remote has finished tx, and all in-flight rx has been received and
- * and pushed to the flip buffer, the remote may close its device. This will
+ * pushed to the flip buffer, the remote may close its device. This will
  * drop DTR on the remote which will drop carrier here. Typically, the tty is
  * hung up when carrier is dropped or lost.
  *