Merge pull request #4484 from ipfs/fix/pollEndpoint-use-debugf

pollEndpoint: use Debugf

thirdparty/pollEndpoint/main.go

@@ -54,7 +54,7 @@ func main() {
 
 	// show what we got
 	start := time.Now()
-	log.Debug("starting at %s, tries: %d, timeout: %s, url: %s", start, *tries, *timeout, u)
+	log.Debugf("starting at %s, tries: %d, timeout: %s, url: %s", start, *tries, *timeout, u)
 
 	for *tries > 0 {