fix compression test error

Signed-off-by: xiaolong.ran <ranxiaolong716@gmail.com>
diff --git a/pkg/compression/lz4.go b/pkg/compression/lz4.go
index 449c205..b391336 100644
--- a/pkg/compression/lz4.go
+++ b/pkg/compression/lz4.go
@@ -21,8 +21,7 @@
 	"github.com/pierrec/lz4"
 )
 
-type lz4Provider struct {
-}
+type lz4Provider struct {}
 
 // NewLz4Provider return a interface of Provider.
 func NewLz4Provider() Provider {
diff --git a/pkg/compression/zlib.go b/pkg/compression/zlib.go
index f1c1b91..4c3fba8 100644
--- a/pkg/compression/zlib.go
+++ b/pkg/compression/zlib.go
@@ -36,14 +36,8 @@
 func (zlibProvider) Compress(data []byte) []byte {
 	var b bytes.Buffer
 	w := zlib.NewWriter(&b)
-	_, err := w.Write(data)
-	if err != nil {
-		return nil
-	}
-	err = w.Close()
-	if err != nil {
-		return nil
-	}
+	w.Write(data)
+	w.Close()
 
 	return b.Bytes()
 }
@@ -55,14 +49,8 @@
 	}
 
 	uncompressed := make([]byte, originalSize)
-	_, err = r.Read(uncompressed)
-	if err != nil {
-		return nil, err
-	}
-	err = r.Close()
-	if err != nil {
-		return nil, err
-	}
+	r.Read(uncompressed)
+	r.Close()
 
 	return uncompressed, nil
 }