[media] cec.h: small typo fix

ad -> as

It won't bring about world peace, but every little bit helps :-)
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

include/uapi/linux/cec.h

@@ -223,7 +223,7 @@ static inline int cec_msg_status_is_ok(const struct cec_msg *msg)
 #define CEC_LOG_ADDR_BACKUP_2		13
 #define CEC_LOG_ADDR_SPECIFIC		14
 #define CEC_LOG_ADDR_UNREGISTERED	15 /* as initiator address */
-#define CEC_LOG_ADDR_BROADCAST		15 /* ad destination address */
+#define CEC_LOG_ADDR_BROADCAST		15 /* as destination address */
 
 /* The logical address types that the CEC device wants to claim */
 #define CEC_LOG_ADDR_TYPE_TV		0