drm/msm: free kstrdup'd cmdline

Fixes: 18bb8a6c 'drm/msm: show task cmdline in gpu recovery messages'
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_gpu.c

@@ -294,6 +294,8 @@ static void recover_worker(struct work_struct *work)
 
 			msm_rd_dump_submit(priv->hangrd, submit,
 				"offending task: %s (%s)", task->comm, cmd);
+
+			kfree(cmd);
 		} else {
 			msm_rd_dump_submit(priv->hangrd, submit, NULL);
 		}