perf evlist: Destructors should accept NULL

And do nothing, just like free(), to avoid having to test it in callers,
usually in error paths.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-mexbavy0ft387j5w89t365eu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 6 insertions, 6 deletions

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 6487c06d2708..ad46e91abec5 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1429,8 +1429,7 @@ out:
         if (kvm->session)
                 perf_session__delete(kvm->session);
         kvm->session = NULL;
-        if (kvm->evlist)
-                perf_evlist__delete(kvm->evlist);
+        perf_evlist__delete(kvm->evlist);
 
         return err;
 }
diff --git a/tools/perf/tests/event-times.c b/tools/perf/tests/event-times.c
index 95fb744f6628..9f5698ac81ae 100644
--- a/tools/perf/tests/event-times.c
+++ b/tools/perf/tests/event-times.c
@@ -200,8 +200,7 @@ static int test_times(int (attach)(struct perf_evlist *),
                  count.ena, count.run);
 
 out_err:
-        if (evlist)
-                perf_evlist__delete(evlist);
+        perf_evlist__delete(evlist);
         return !err ? TEST_OK : TEST_FAIL;
 }
 
diff --git a/tools/perf/tests/parse-no-sample-id-all.c b/tools/perf/tests/parse-no-sample-id-all.c
index 294c76b01b41..81c6eeaca0f5 100644
--- a/tools/perf/tests/parse-no-sample-id-all.c
+++ b/tools/perf/tests/parse-no-sample-id-all.c
@@ -44,8 +44,7 @@ static int process_events(union perf_event **events, size_t count)
         for (i = 0; i < count && !err; i++)
                 err = process_event(&evlist, events[i]);
 
-        if (evlist)
-                perf_evlist__delete(evlist);
+        perf_evlist__delete(evlist);
 
         return err;
 }
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 1b918aa075d6..fcb8f1ff7806 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -127,6 +127,9 @@ void perf_evlist__exit(struct perf_evlist *evlist)
 
 void perf_evlist__delete(struct perf_evlist *evlist)
 {
+        if (evlist == NULL)
+                return;
+
         perf_evlist__munmap(evlist);
         perf_evlist__close(evlist);
         cpu_map__put(evlist->cpus);