diff --git a/avformat/mpegts/mpegts.go b/avformat/mpegts/mpegts.go
index d44ee1f..63c5a8e 100644
--- a/avformat/mpegts/mpegts.go
+++ b/avformat/mpegts/mpegts.go
@@ -574,5 +574,4 @@ func (s *MpegTsStream) Feed(ts io.Reader) error {
 			}
 		}
 	}
-	return nil
 }
diff --git a/util/bits/pio/vec_test.go b/util/bits/pio/vec_test.go
index 8c43769..b435466 100644
--- a/util/bits/pio/vec_test.go
+++ b/util/bits/pio/vec_test.go
@@ -2,9 +2,10 @@ package pio
 
 import (
 	"fmt"
+	"testing"
 )
 
-func ExampleVec() {
+func TestExampleVec(t *testing.T) {
 	vec := [][]byte{[]byte{1, 2, 3}, []byte{4, 5, 6, 7, 8, 9}, []byte{10, 11, 12, 13}}
 	println(VecLen(vec))
 
diff --git a/util/util.go b/util/util.go
index 7ac63d6..2f383ca 100644
--- a/util/util.go
+++ b/util/util.go
@@ -37,8 +37,6 @@ func ReadFileLines(filename string) (lines []string, err error) {
 
 		lines = append(lines, string(line))
 	}
-
-	return
 }
 
 func CurrentDir(path ...string) string {