backend: remove a few unnecessary debug logs

internal/backend/mem/mem_backend.go

@@ -144,8 +144,6 @@ func (be *MemoryBackend) Remove(ctx context.Context, h restic.Handle) error {
 	be.m.Lock()
 	defer be.m.Unlock()
 
-	debug.Log("Remove %v", h)
-
 	h.ContainedBlobType = restic.InvalidBlob
 	if _, ok := be.data[h]; !ok {
 		return errNotFound

internal/backend/rest/rest.go

@@ -207,7 +207,6 @@ func (b *Backend) openReader(ctx context.Context, h restic.Handle, length int, o
 	}
 	req.Header.Set("Range", byteRange)
 	req.Header.Set("Accept", ContentTypeV2)
-	debug.Log("Load(%v) send range %v", h, byteRange)
 
 	resp, err := b.client.Do(req)
 

internal/backend/s3/s3.go

@@ -271,7 +271,6 @@ func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindRe
 	// only use multipart uploads for very large files
 	opts.PartSize = 200 * 1024 * 1024
 
-	debug.Log("PutObject(%v, %v, %v)", be.cfg.Bucket, objName, rd.Length())
 	info, err := be.client.PutObject(ctx, be.cfg.Bucket, objName, io.NopCloser(rd), int64(rd.Length()), opts)
 
 	// sanity check
@@ -297,10 +296,8 @@ func (be *Backend) openReader(ctx context.Context, h restic.Handle, length int,
 
 	var err error
 	if length > 0 {
-		debug.Log("range: %v-%v", offset, offset+int64(length)-1)
 		err = opts.SetRange(offset, offset+int64(length)-1)
 	} else if offset > 0 {
-		debug.Log("range: %v-", offset)
 		err = opts.SetRange(offset, 0)
 	}
 

internal/backend/swift/swift.go

@@ -146,10 +146,6 @@ func (be *beSwift) openReader(ctx context.Context, h restic.Handle, length int,
 		headers["Range"] = fmt.Sprintf("bytes=%d-%d", offset, offset+int64(length)-1)
 	}
 
-	if _, ok := headers["Range"]; ok {
-		debug.Log("Load(%v) send range %v", h, headers["Range"])
-	}
-
 	obj, _, err := be.conn.ObjectOpen(ctx, be.container, objName, false, headers)
 	if err != nil {
 		return nil, errors.Wrap(err, "conn.ObjectOpen")
@@ -163,7 +159,6 @@ func (be *beSwift) Save(ctx context.Context, h restic.Handle, rd restic.RewindRe
 	objName := be.Filename(h)
 	encoding := "binary/octet-stream"
 
-	debug.Log("PutObject(%v, %v, %v)", be.container, objName, encoding)
 	hdr := swift.Headers{"Content-Length": strconv.FormatInt(rd.Length(), 10)}
 	_, err := be.conn.ObjectPut(ctx,
 		be.container, objName, rd, true, hex.EncodeToString(rd.Hash()),