libperf: Add perf_evlist__remove() function

Adding perf_evlist__remove() function to remove a perf_evsel from
a perf_evlist struct.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-41-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index e5f187f..023fe4b 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -14,3 +14,9 @@ void perf_evlist__add(struct perf_evlist *evlist,
 {
 	list_add_tail(&evsel->node, &evlist->entries);
 }
+
+void perf_evlist__remove(struct perf_evlist *evlist,
+			 struct perf_evsel *evsel)
+{
+	list_del_init(&evsel->node);
+}