code review 5372080: syscall: use error

src/pkg/syscall/route_darwin.go

 // Copyright 2011 The Go Authors.  All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Routing sockets and messages for Darwin
 
 package syscall
 
 import (
         "unsafe"
@@ skipping 45 matching lines @@
 
         buf := m.Data[:]
         for i := uint(0); i < RTAX_MAX; i++ {
                 if m.Header.Addrs&rtaIfmaMask&(1<<i) == 0 {
                         continue
                 }
                 rsa := (*RawSockaddr)(unsafe.Pointer(&buf[0]))
                 switch i {
                 case RTAX_IFA:
                         sa, e := anyToSockaddr((*RawSockaddrAny)(unsafe.Pointer(rsa)))
-                        if e != 0 {
+                        if e != nil {
                                 return nil
                         }
                         sas = append(sas, sa)
                 case RTAX_GATEWAY, RTAX_IFP:
                         // nothing to do
                 }
                 buf = buf[rsaAlignOf(int(rsa.Len)):]
         }
 
         return sas
 }