refactor: avoid unnecessary go-routine

internal/session/sessionwantsender.go

@@ -368,7 +368,6 @@ func (sws *sessionWantSender) processUpdates(updates []update) []cid.Cid {
 
 	// If any peers have sent us too many consecutive DONT_HAVEs, remove them
 	// from the session
-	if len(prunePeers) > 0 {
 	for p := range prunePeers {
 		// Before removing the peer from the session, check if the peer
 		// sent us a HAVE for a block that we want
@@ -379,6 +378,7 @@ func (sws *sessionWantSender) processUpdates(updates []update) []cid.Cid {
 			}
 		}
 	}
+	if len(prunePeers) > 0 {
 		go func() {
 			for p := range prunePeers {
 				// Peer doesn't have anything we want, so remove it