drm/lima: fix reference leak in lima_pm_busy

pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to putting operation will result in a
reference leak here.

A new function pm_runtime_resume_and_get is introduced in
[0] to keep usage counter balanced. So We fix the reference
leak by replacing it with new function.

[0] commit dd8088d5 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: 50de2e9e ("drm/lima: enable runtime pm")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201127094438.121003-1-miaoqinglang@huawei.com

drivers/gpu/drm/lima/lima_sched.c

@@ -201,7 +201,7 @@ static int lima_pm_busy(struct lima_device *ldev)
 	int ret;
 
 	/* resume GPU if it has been suspended by runtime PM */
-	ret = pm_runtime_get_sync(ldev->dev);
+	ret = pm_runtime_resume_and_get(ldev->dev);
 	if (ret < 0)
 		return ret;