vfs: ignore file not found errors from Hash in Read.Release

There is nothing we can do about this at this point and this error can
happen when moving files so we ignore it to clean the logs up.

vfs/read.go

@@ -344,6 +344,11 @@ func (fh *ReadFileHandle) checkHash() error {
 	for hashType, dstSum := range fh.hash.Sums() {
 		srcSum, err := o.Hash(context.TODO(), hashType)
 		if err != nil {
+			if os.IsNotExist(errors.Cause(err)) {
+				// if it was file not found then at
+				// this point we don't care any more
+				continue
+			}
 			return err
 		}
 		if !hash.Equals(dstSum, srcSum) {