Add call to loadFn hook

Also add error return.

cayley.go

@@ -305,6 +305,10 @@ func decompressAndLoad(qw graph.QuadWriter, cfg *config.Config, path, typ string
 		return fmt.Errorf("unknown quad format %q", typ)
 	}
 
+	if loadFn != nil {
+		return loadFn(qw, cfg, dec)
+	}
+
 	return db.Load(qw, cfg, dec)
 }
 

cayley_test.go

@@ -454,7 +454,10 @@ func remove(qw graph.QuadWriter, cfg *config.Config, dec quad.Unmarshaler) error
 			}
 			return err
 		}
-		qw.RemoveQuad(t)
+		err = qw.RemoveQuad(t)
+		if err != nil {
+			return err
+		}
 	}
 	return nil
 }