fix: reduce nesting

pkg/pushsync/pushsync.go

@@ -299,26 +299,27 @@ func (ps *PushSync) pushToClosest(ctx context.Context, ch swarm.Chunk, retryAllo
 					return nil, ErrWarmup
 				}
 
-				if ps.topologyDriver.IsWithinDepth(ch.Address()) {
-					count := 0
-					// Push the chunk to some peers in the neighborhood in parallel for replication.
-					// Any errors here should NOT impact the rest of the handler.
-					_ = ps.topologyDriver.EachNeighbor(func(peer swarm.Address, po uint8) (bool, bool, error) {
-						// skip forwarding peer
-						if peer.Equal(origin) {
-							return false, false, nil
-						}
-
-						if count == nPeersToPushsync {
-							return true, false, nil
-						}
-						count++
-						go ps.pushToNeighbour(peer, ch, retryAllowed)
-						return false, false, nil
-					})
-					return nil, err
+				if !ps.topologyDriver.IsWithinDepth(ch.Address()) {
+					return nil, ErrNoPush
 				}
-				return nil, fmt.Errorf("closest peer: none available")
+
+				count := 0
+				// Push the chunk to some peers in the neighborhood in parallel for replication.
+				// Any errors here should NOT impact the rest of the handler.
+				_ = ps.topologyDriver.EachNeighbor(func(peer swarm.Address, po uint8) (bool, bool, error) {
+					// skip forwarding peer
+					if peer.Equal(origin) {
+						return false, false, nil
+					}
+
+					if count == nPeersToPushsync {
+						return true, false, nil
+					}
+					count++
+					go ps.pushToNeighbour(peer, ch, retryAllowed)
+					return false, false, nil
+				})
+				return nil, err
 			}
 			return nil, fmt.Errorf("closest peer: %w", err)
 		}