rpmsg: glink: Release driver_override

JIRA: https://issues.redhat.com/browse/RHEL-78824

commit fb80ef6
Author: Bjorn Andersson <quic_bjorande@quicinc.com>
Date:   Mon Jan 9 14:39:31 2023 -0800

    rpmsg: glink: Release driver_override

    Upon termination of the rpmsg_device, driver_override needs to be freed
    to avoid leaking the potentially assigned string.

    Fixes: 42cd402 ("rpmsg: Fix kfree() of static memory on setting driver_override")
    Fixes: 39e4776 ("rpmsg: Add driver_override device attribute for rpmsg_device")
    Reviewed-by: Chris Lew <quic_clew@quicinc.com>
    Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
    Signed-off-by: Bjorn Andersson <andersson@kernel.org>
    Link: https://lore.kernel.org/r/20230109223931.1706429-1-quic_bjorande@quicinc.com

Signed-off-by: Jared Kangas <jkangas@redhat.com>

Author: rh-jkangas

drivers/rpmsg/qcom_glink_native.c

@@ -1448,6 +1448,7 @@ static void qcom_glink_rpdev_release(struct device *dev)
 {
 	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
 
+	kfree(rpdev->driver_override);
 	kfree(rpdev);
 }
 
@@ -1691,6 +1692,7 @@ static void qcom_glink_device_release(struct device *dev)
 
 	/* Release qcom_glink_alloc_channel() reference */
 	kref_put(&channel->refcount, qcom_glink_channel_release);
+	kfree(rpdev->driver_override);
 	kfree(rpdev);
 }