[media] firewire: use dev_dbg() instead of printk()

A structure for firedtv (struct firedtv) has a member for a pointer to
struct device. In this case, we can use dev_dbg() for debug printing.
This is more preferrable behaviour in device driver development.

Signed-off-by: Takashi Sakamoto <[e-mail]>
Acked-by: Stefan Richter <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/firewire/firedtv-rc.c

···
 	else if (code >= 0x4540 && code <= 0x4542)
 		code = oldtable[code - 0x4521];
 	else {
-		printk(KERN_DEBUG "firedtv: invalid key code 0x%04x "
-		       "from remote control\n", code);
+		dev_dbg(fdtv->device,
+			"invalid key code 0x%04x from remote control\n",
+			code);
 		return;
 	}