media: cec-adap: return from cec_s_conn_info() if adap is invalid

Check if cec_s_conn_info is called with a valid cec adapter,
do nothing if it is invalid.

This makes it possible to call this function even if CEC support is
disabled in the kernel config.
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

@@ -1614,6 +1614,9 @@ EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
 void cec_s_conn_info(struct cec_adapter *adap,
 		     const struct cec_connector_info *conn_info)
 {
+	if (IS_ERR_OR_NULL(adap))
+		return;
+
 	if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
 		return;