staging: pi433: add index value to write dev_dbg statement

Add index value to the string that will be printed by dev_dbg for better
easier visualisation when debugging. For instance, if I have a big
message payload that will inevitably get split into chunks, it would be
a hassle trying to debug if the offset of the original payload that got
sent at that time.

This patch adds index value to write dev_dbg statement.

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Link: https://lore.kernel.org/r/YhiNRSi7jijxJWCL@mail.google.com


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