pkg/signal: optimize Split()

If all signal is to be returned to the caller, there's no sense in
deleting it from the original map. Just swap it.

1 files changed, 4 insertions, 2 deletions

diff --git a/pkg/signal/signal.go b/pkg/signal/signal.go
index 86c4a4ab9..7a2a8bd16 100644
--- a/pkg/signal/signal.go
+++ b/pkg/signal/signal.go
@@ -33,8 +33,10 @@ func (s Signal) Copy() Signal {
 }
 
 func (s *Signal) Split(n int) Signal {
-	if s.Empty() {
-		return nil
+	if n >= s.Len() {
+		ret := *s
+		*s = nil
+		return ret
 	}
 	c := make(Signal, n)
 	for e, p := range *s {