Remove uncessary err != nil check. (#3346)

cmd/auth-rpc-client.go

@@ -180,7 +180,7 @@ func (authClient *AuthRPCClient) Call(serviceMethod string, args interface {
 		err = authClient.rpc.Call(serviceMethod, args, reply)
 
 		// Invalidate token, and mark it for re-login on subsequent reconnect.
-		if err != nil && err == rpc.ErrShutdown {
+		if err == rpc.ErrShutdown {
 			authClient.mu.Lock()
 			authClient.isLoggedIn = false
 			authClient.mu.Unlock()

cmd/posix-errors.go

@@ -24,22 +24,22 @@ import (
 
 // Function not implemented error
 func isSysErrNoSys(err error) bool {
-	return err != nil && err == syscall.ENOSYS
+	return err == syscall.ENOSYS
 }
 
 // Not supported error
 func isSysErrOpNotSupported(err error) bool {
-	return err != nil && err == syscall.EOPNOTSUPP
+	return err == syscall.EOPNOTSUPP
 }
 
 // No space left on device error
 func isSysErrNoSpace(err error) bool {
-	return err != nil && err == syscall.ENOSPC
+	return err == syscall.ENOSPC
 }
 
 // Input/output error
 func isSysErrIO(err error) bool {
-	return err != nil && err == syscall.EIO
+	return err == syscall.EIO
 }
 
 // Check if the given error corresponds to ENOTDIR (is not a directory).