[PATCH v2] perf tools: use PTR_ERR_OR_ZERO inetead of return code

[Ding Xiang]

use PTR_ERR_OR_ZERO for bpf__setup_stdout return code

v2: add macro PTR_ERR_OR_ZERO to err.h

Signed-off-by: Ding Xiang <dingxi...@cmss.chinamobile.com>
---
 tools/include/linux/err.h    | 7 +++++++
 tools/perf/util/bpf-loader.c | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/include/linux/err.h b/tools/include/linux/err.h
index 7a8b61a..0946496 100644
--- a/tools/include/linux/err.h
+++ b/tools/include/linux/err.h
@@ -52,4 +52,11 @@ static inline bool __must_check IS_ERR_OR_NULL(__force const 
void *ptr)
        return unlikely(!ptr) || IS_ERR_VALUE((unsigned long)ptr);
 }
 
+static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
+{
+       if (IS_ERR(ptr))
+               return PTR_ERR(ptr);
+       else
+               return 0;
+}
 #endif /* _LINUX_ERR_H */
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 47aac41..f9ae1a9 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -1615,7 +1615,7 @@ struct perf_evsel *bpf__setup_output_event(struct 
perf_evlist *evlist, const cha
 int bpf__setup_stdout(struct perf_evlist *evlist)
 {
        struct perf_evsel *evsel = bpf__setup_output_event(evlist, 
"__bpf_stdout__");
-       return IS_ERR(evsel) ? PTR_ERR(evsel) : 0;
+       return PTR_ERR_OR_ZERO(evsel);
 }
 
 #define ERRNO_OFFSET(e)                ((e) - __BPF_LOADER_ERRNO__START)
-- 
1.9.1