staging: pi433: standardize use of line escape chars in dev_dbg stmts

staging: pi433: standardize use of line escape chars in dev_dbg stmts

In this driver there are strings ending with of both '\n' and ''
(without '\n') when using dev_dbg function. While it doesn't affect
drivers functionality, it would be good to keep it consistent across the
driver's source code.

This patch add '\n' characters where it's missing to make it consistent
with the other dev_dbg instances.

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Link: https://lore.kernel.org/r/YgA4XHU4uf6YkOk5@mail.google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>