Removes redundant iteration over check.

Author: nalanj

walk.go

@@ -173,10 +173,6 @@ func (v *RevWalk) Iterate(fun RevWalkIterator) (err error) {
 			return nil
 		}
 		if err != nil {
-			if err.(*GitError).Code == ErrIterOver {
-				err = nil
-			}
-
 			return err
 		}