[media] cec: add check if adapter is unregistered

CEC USB dongles can be unplugged at any time, and at that point they will
be unregistered. Make sure that any attempt afterwards to set the physical
or logical addresses will be ignored.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -1104,7 +1104,7 @@ static void cec_claim_log_addrs(struct cec_adapter *adap, bool block)
  */
 void __cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr, bool block)
 {
-	if (phys_addr == adap->phys_addr)
+	if (phys_addr == adap->phys_addr || adap->devnode.unregistered)
 		return;
 
 	if (phys_addr == CEC_PHYS_ADDR_INVALID ||
@@ -1158,6 +1158,9 @@ int __cec_s_log_addrs(struct cec_adapter *adap,
 	u16 type_mask = 0;
 	int i;
 
+	if (adap->devnode.unregistered)
+		return -ENODEV;
+
 	if (!log_addrs || log_addrs->num_log_addrs == 0) {
 		adap->log_addrs.num_log_addrs = 0;
 		cec_adap_unconfigure(adap);