[PATCH -next] tracing: Fix return value check in trace_benchmark_reg()

[Wei Yongjun]

From: Wei Yongjun <weiyongj...@huawei.com>

In case of error, the function kthread_run() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 kernel/trace/trace_benchmark.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_benchmark.c b/kernel/trace/trace_benchmark.c
index e3b4888..e49fbe9 100644
--- a/kernel/trace/trace_benchmark.c
+++ b/kernel/trace/trace_benchmark.c
@@ -175,9 +175,9 @@ int trace_benchmark_reg(void)
 
        bm_event_thread = kthread_run(benchmark_event_kthread,
                                      NULL, "event_benchmark");
-       if (!bm_event_thread) {
+       if (IS_ERR(bm_event_thread)) {
                pr_warning("trace benchmark failed to create kernel thread\n");
-               return -ENOMEM;
+               return PTR_ERR(bm_event_thread);
        }
 
        return 0;