multi: enable prealloc linter for non-test code

.golangci.yml

@@ -32,10 +32,6 @@ linters:
     # land.
     - gocyclo
 
-    # Instances of table driven tests that don't pre-allocate shouldn't trigger
-    # the linter.
-    - prealloc
-
     # Init functions are used by loggers throughout the codebase.
     - gochecknoinits
 
@@ -48,3 +44,7 @@ issues:
         - gosec
         - errcheck
         - dupl
+
+        # Instances of table driven tests that don't pre-allocate shouldn't
+        # trigger the linter.
+        - prealloc

blockmanager.go

@@ -822,12 +822,12 @@ type checkpointedCFHeadersQuery struct {
 
 // requests creates the query.Requests for this CF headers query.
 func (c *checkpointedCFHeadersQuery) requests() []*query.Request {
-	var reqs []*query.Request
-	for _, m := range c.msgs {
-		reqs = append(reqs, &query.Request{
+	reqs := make([]*query.Request, len(c.msgs))
+	for idx, m := range c.msgs {
+		reqs[idx] = &query.Request{
 			Req:        m,
 			HandleResp: c.handleResponse,
-		})
+		}
 	}
 	return reqs
 }

neutrino.go

@@ -337,7 +337,7 @@ func (sp *ServerPeer) OnAddr(_ *peer.Peer, msg *wire.MsgAddr) {
 		return
 	}
 
-	var addrsSupportingServices []*wire.NetAddress
+	addrsSupportingServices := make([]*wire.NetAddress, 0, len(msg.AddrList))
 	for _, na := range msg.AddrList {
 		// Don't add more address if we're disconnecting.
 		if !sp.Connected() {