[tip:perf/core] tools include: Adopt PTR_ERR_OR_ZERO from the kernel err.h header

[tip-bot for Ding Xiang]

Commit-ID:  01ab2e91103b8c23dfedfeb799bc8b810d585bd0
Gitweb:     https://git.kernel.org/tip/01ab2e91103b8c23dfedfeb799bc8b810d585bd0
Author:     Ding Xiang <dingxiang@xxxxxxxxxxxxxxxxxxxx>
AuthorDate: Fri, 7 Sep 2018 09:34:41 +0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 19 Sep 2018 10:25:08 -0300

tools include: Adopt PTR_ERR_OR_ZERO from the kernel err.h header

Add PTR_ERR_OR_ZERO, so that tools can use it, just like the kernel.

Signed-off-by: Ding Xiang <dingxiang@xxxxxxxxxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1536284082-23466-1-git-send-email-dingxiang@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/include/linux/err.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/include/linux/err.h b/tools/include/linux/err.h
index 7a8b61ad44cb..094649667bae 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 */