Fix follower not authenticating after aofshink

internal/server/checksum.go

@@ -138,7 +138,8 @@ func getEndOfLastValuePositionInFile(fname string, startPos int64) (int64, error
 
 // followCheckSome is not a full checksum. It just "checks some" data.
 // We will do some various checksums on the leader until we find the correct position to start at.
-func (s *Server) followCheckSome(addr string, followc int) (pos int64, err error) {
+func (s *Server) followCheckSome(addr string, followc int, auth string,
+) (pos int64, err error) {
 	if core.ShowDebugMessages {
 		log.Debug("follow:", addr, ":check some")
 	}
@@ -157,6 +158,12 @@ func (s *Server) followCheckSome(addr string, followc int) (pos int64, err error
 	}
 	defer conn.Close()
 
+	if auth != "" {
+		if err := s.followDoLeaderAuth(conn, auth); err != nil {
+			return 0, err
+		}
+	}
+
 	min := int64(0)
 	max := int64(s.aofsz) - checksumsz
 	limit := int64(s.aofsz)

internal/server/follow.go

@@ -225,7 +225,7 @@ func (s *Server) followStep(host string, port int, followc int) error {
 	}
 
 	// verify checksum
-	pos, err := s.followCheckSome(addr, followc)
+	pos, err := s.followCheckSome(addr, followc, auth)
 	if err != nil {
 		return err
 	}