staging: fwserial: Remove repeated word and

Remove unnecessary repeated word and

Signed-off-by: Abheek Dhawan <adawesomeguy222@gmail.com>
Link: https://lore.kernel.org/r/20200912064123.411656-1-adawesomeguy222@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>