staging: pi433: remove duplicated comments

Remove duplicated words in comments for readability. The words are
duplicated from a sentence below.

Signed-off-by: Sidong Yang <realwakka@gmail.com>
Link: https://lore.kernel.org/r/20220725114513.85089-1-realwakka@gmail.com


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