rpmsg: Fix possible refcount leak in rpmsg_register_device_override()

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

commit d7bd416
Author: Hangyu Hua <hbh25y@gmail.com>
Date:   Fri Jun 24 10:41:20 2022 +0800

    rpmsg: Fix possible refcount leak in rpmsg_register_device_override()

    rpmsg_register_device_override need to call put_device to free vch when
    driver_set_override fails.

    Fix this by adding a put_device() to the error path.

    Fixes: bb17d11 ("rpmsg: Fix calling device_lock() on non-initialized device")
    Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
    Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
    Link: https://lore.kernel.org/r/20220624024120.11576-1-hbh25y@gmail.com
    Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

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

Author: rh-jkangas

drivers/rpmsg/rpmsg_core.c

@@ -618,6 +618,7 @@ int rpmsg_register_device_override(struct rpmsg_device *rpdev,
 					  strlen(driver_override));
 		if (ret) {
 			dev_err(dev, "device_set_override failed: %d\n", ret);
+			put_device(dev);
 			return ret;
 		}
 	}