monitor/intel: Fix not skipping unknown TLV types

The code was stopping at first time it detected an unknown TLV type when
it could continue:

> HCI Event: Vendor (0xff) plen 82
        Vendor Prefix (0x8780)
      Intel Extended Telemetry (0x03)
        Extended event type (0x01): Audio Link Quality Report Type (0x05)
        Unknown extended subevent 0x81
        01 01 05 81 04 88 13 00 00 82 10 6a e6 6c 00 00  ...........j.l..
        00 00 00 4b 45 53 00 00 00 00 00 83 04 00 00 00  ...KES..........
        00 84 04 01 03 07 19 85 04 3f 08 00 00 86 08 00  .........?......
        00 00 00 00 00 00 00 87 04 00 00 00 00 88 04 00  ................
        00 00 00 89 04 00 00 00 00 8a 04 b9 49 0c 00     ............I..

So this changes it to:

> HCI Event: Vendor (0xff) plen 82
        Vendor Prefix (0x8780)
      Intel Extended Telemetry (0x03)
        Extended event type (0x01): Audio Link Quality Report Type (0x05)
        Unknown extended subevent 0x81
        88 13 00 00                                      ....
        Unknown extended subevent 0x82
        04 97 6c 00 00 00 00 00 68 44 53 00 00 00 00 00  ..l.....hDS.....
        Unknown extended subevent 0x83
        00 00 00 00                                      ....
        Unknown extended subevent 0x84
        01 03 07 19                                      ....
        Unknown extended subevent 0x85
        3a 08 00 00                                      :...
        Unknown extended subevent 0x86
        00 00 00 00 00 00 00 00                          ........
        Unknown extended subevent 0x87
        00 00 00 00                                      ....
        Unknown extended subevent 0x88
        00 00 00 00                                      ....
        Unknown extended subevent 0x89
        00 00 00 00                                      ....
        Unknown extended subevent 0x8a
        9f 1a 2f 00                                      ../.

monitor/intel.c

@@ -1606,7 +1606,8 @@ static const struct intel_tlv *process_ext_subevent(const struct intel_tlv *tlv,
 		print_text(COLOR_UNKNOWN_EXT_EVENT,
 				"Unknown extended subevent 0x%2.2x",
 				tlv->subevent_id);
-		return NULL;
+		packet_hexdump(tlv->value, tlv->length);
+		return next_tlv;
 	}
 
 	if (tlv->length != subevent->length) {