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>

drivers/staging/pi433/rf69.c

@@ -869,7 +869,7 @@ int rf69_write_fifo(struct spi_device *spi, u8 *buffer, unsigned int size)
 
 	/* print content written from fifo for debugging purposes */
 	for (i = 0; i < size; i++)
-		dev_dbg(&spi->dev, "0x%x\n", buffer[i]);
+		dev_dbg(&spi->dev, "%d - 0x%x\n", i, buffer[i]);
 
 	return spi_write(spi, local_buffer, size + 1);
 }