[PATCH][next] perf cputopo: Use struct_size() helper

[Gustavo A. R. Silva]

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 tools/perf/util/cputopo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 1b52402a8923..1d1b26e39f12 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -7,6 +7,7 @@
 #include <api/fs/fs.h>
 #include <linux/zalloc.h>
 #include <perf/cpumap.h>
+#include <linux/overflow.h>
 
 #include "cputopo.h"
 #include "cpumap.h"
@@ -321,7 +322,7 @@ struct numa_topology *numa_topology__new(void)
 
 	nr = (u32) node_map->nr;
 
-	tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0])*nr);
+	tp = zalloc(struct_size(tp, nodes, nr));
 	if (!tp)
 		goto out;
 
-- 
2.27.0