nrreddis-v9 bug fix: check host is empty

fixes an nrreddis 9 bug that was caused by checking that a host was not equal to an empty string, rather than checking that it was equal to an empty string.

Co-authored-by: Guntur Akhmad <gunturaf@gmail.com>

v3/integrations/nrredis-v9/nrredis.go

@@ -51,7 +51,7 @@ func NewHook(opts *redis.Options) redis.Hook {
 		return h
 	}
 	if host, port, err := net.SplitHostPort(opts.Addr); err == nil {
-		if host != "" {
+		if host == "" {
 			host = "localhost"
 		}
 		h.segment.Host = host