small cleanup:

- be explicit when discarding returned errors from .Close(), etc.
- remove named return values from funcs when naked return not used
- fix some "err" shadowing when redeclaration not needed

internal/backend/b2/b2.go

@@ -218,7 +218,7 @@ func (be *b2Backend) Load(ctx context.Context, h restic.Handle, length int, offs
 }
 
 // Save stores data in the backend at the handle.
-func (be *b2Backend) Save(ctx context.Context, h restic.Handle, rd io.Reader) (err error) {
+func (be *b2Backend) Save(ctx context.Context, h restic.Handle, rd io.Reader) (error) {
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
@@ -233,7 +233,7 @@ func (be *b2Backend) Save(ctx context.Context, h restic.Handle, rd io.Reader) (e
 	debug.Log("Save %v, name %v", h, name)
 	obj := be.bucket.Object(name)
 
-	_, err = obj.Attrs(ctx)
+	_, err := obj.Attrs(ctx)
 	if err == nil {
 		debug.Log("  %v already exists", h)
 		return errors.New("key already exists")

internal/backend/local/local.go

@@ -118,7 +118,7 @@ func (b *Local) IsNotExist(err error) bool {
 }
 
 // Save stores data in the backend at the handle.
-func (b *Local) Save(ctx context.Context, h restic.Handle, rd io.Reader) (err error) {
+func (b *Local) Save(ctx context.Context, h restic.Handle, rd io.Reader) (error) {
 	debug.Log("Save %v", h)
 	if err := h.Valid(); err != nil {
 		return err

internal/cache/cache.go

@@ -70,7 +70,7 @@ func writeCachedirTag(dir string) error {
 
 	debug.Log("Create CACHEDIR.TAG at %v", dir)
 	if _, err := f.Write([]byte(cachedirTagSignature)); err != nil {
-		f.Close()
+		_ = f.Close()
 		return errors.Wrap(err, "Write")
 	}
 

internal/cache/file.go

@@ -65,7 +65,7 @@ func (c *Cache) Load(h restic.Handle, length int, offset int64) (io.ReadCloser,
 
 	if offset > 0 {
 		if _, err = f.Seek(offset, io.SeekStart); err != nil {
-			f.Close()
+			_ = f.Close()
 			return nil, err
 		}
 	}

internal/checker/checker.go

@@ -674,8 +674,8 @@ func checkPack(ctx context.Context, r restic.Repository, id restic.ID) error {
 	}
 
 	defer func() {
-		packfile.Close()
-		os.Remove(packfile.Name())
+		_ = packfile.Close()
+		_ = os.Remove(packfile.Name())
 	}()
 
 	hrd := hashing.NewReader(rd, sha256.New())

internal/pipe/pipe.go

@@ -67,7 +67,7 @@ func readDirNames(dirname string) ([]string, error) {
 		return nil, errors.Wrap(err, "Open")
 	}
 	names, err := f.Readdirnames(-1)
-	f.Close()
+	_ = f.Close()
 	if err != nil {
 		return nil, errors.Wrap(err, "Readdirnames")
 	}

internal/restic/lock.go

@@ -109,7 +109,7 @@ func newLock(ctx context.Context, repo Repository, excl bool) (*Lock, error) {
 	time.Sleep(waitBeforeLockCheck)
 
 	if err = lock.checkForOtherLocks(ctx); err != nil {
-		lock.Unlock()
+		_ = lock.Unlock()
 		return nil, err
 	}
 

internal/restic/restorer.go

@@ -51,7 +51,7 @@ func (res *Restorer) restoreTo(ctx context.Context, dst string, dir string, tree
 		debug.Log("SelectFilter returned %v %v", selectedForRestore, childMayBeSelected)
 
 		if selectedForRestore {
-			err := res.restoreNodeTo(ctx, node, dir, dst, idx)
+			err = res.restoreNodeTo(ctx, node, dir, dst, idx)
 			if err != nil {
 				return err
 			}
@@ -74,7 +74,8 @@ func (res *Restorer) restoreTo(ctx context.Context, dst string, dir string, tree
 			if selectedForRestore {
 				// Restore directory timestamp at the end. If we would do it earlier, restoring files within
 				// the directory would overwrite the timestamp of the directory they are in.
-				if err := node.RestoreTimestamps(filepath.Join(dst, dir, node.Name)); err != nil {
+				err = node.RestoreTimestamps(filepath.Join(dst, dir, node.Name))
+				if err != nil {
 					return err
 				}
 			}