fsm.c: print human-readable msg name for recv packets

Signed-off-by: Aurelio Colosimo <aurelio@aureliocolosimo.it>

fsm.c

@@ -75,10 +75,10 @@ int pp_state_machine(struct pp_instance *ppi, uint8_t *packet, int plen)
 
 	if (plen)
 		pp_diag(ppi, frames, 1,
-			"RECV %02d bytes at %d.%09d (type %x)\n", plen,
+			"RECV %02d bytes at %d.%09d (type %x, %s)\n", plen,
 			   (int)ppi->last_rcv_time.seconds,
 			   (int)ppi->last_rcv_time.nanoseconds,
-			   packet[0] & 0xf);
+			   packet[0] & 0xf, pp_msg_names[packet[0] & 0xf]);
 
 	/*
 	 * Since all ptp frames have the same header, parse it now.

proto-standard/msg.c

@@ -326,7 +326,7 @@ void msg_unpack_delay_resp(void *buf, MsgDelayResp *resp)
 		htons(*(UInteger16 *) (buf + 52));
 }
 
-const char const *pp_msg_names[] = {
+const char const *pp_msg_names[16] = {
 	[PPM_SYNC] =			"sync",
 	[PPM_DELAY_REQ] =		"delay_req",
 	[PPM_PDELAY_REQ] =		"pdelay_req",