media: cec-adap: fix regression in ping sanity check

Commit b6c96e15 inadvertently also dropped the 'msg->len > 1' test
from the preceding sanity check. This caused compliance test failures.

Fixes: b6c96e15 ("media: cec: allow any initiator for Ping and Image/Text View On")
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/cec/cec-adap.c

@@ -809,7 +809,7 @@ int cec_transmit_msg_fh(struct cec_adapter *adap, struct cec_msg *msg,
 				__func__);
 			return -EINVAL;
 		}
-		if (adap->is_configured &&
+		if (msg->len > 1 && adap->is_configured &&
 		    !cec_has_log_addr(adap, cec_msg_initiator(msg))) {
 			dprintk(1, "%s: initiator has unknown logical address %d\n",
 				__func__, cec_msg_initiator(msg));