[PATCH] perf stat: Fix NULL vs IS_ERR() checking in check_per_pkg

[Miaoqian Lin]

The hashmap__new() function does not return NULL on errors. It returns
ERR_PTR(-ENOMEM). Using IS_ERR() to check the return value
to fix this.

Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
---
 tools/perf/util/stat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 09ea334586f2..a77052680087 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -311,8 +311,8 @@ static int check_per_pkg(struct evsel *counter,
 
 	if (!mask) {
 		mask = hashmap__new(pkg_id_hash, pkg_id_equal, NULL);
-		if (!mask)
-			return -ENOMEM;
+		if (IS_ERR(mask))
+			return PTR_ERR(mask);
 
 		counter->per_pkg_mask = mask;
 	}
-- 
2.17.1