[media] pulse8-cec: fix non static symbol warning

Fixes the following sparse warning:

drivers/staging/media/pulse8-cec/pulse8-cec.c:427:27: warning:
 symbol 'pulse8_cec_adap_ops' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/pulse8-cec/pulse8-cec.c

@@ -424,7 +424,7 @@ static int pulse8_received(struct cec_adapter *adap, struct cec_msg *msg)
 	return -ENOMSG;
 }
 
-const struct cec_adap_ops pulse8_cec_adap_ops = {
+static const struct cec_adap_ops pulse8_cec_adap_ops = {
 	.adap_enable = pulse8_cec_adap_enable,
 	.adap_log_addr = pulse8_cec_adap_log_addr,
 	.adap_transmit = pulse8_cec_adap_transmit,