Bluetooth: Fix checkpatch error in cmtp.h

Do not use C99 // comments.
Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

net/bluetooth/cmtp/cmtp.h

@@ -37,7 +37,7 @@
 #define CMTP_LOOPBACK	0
 
 struct cmtp_connadd_req {
-	int   sock;	// Connected socket
+	int   sock;	/* Connected socket */
 	__u32 flags;
 };