git-add--interactive.perl: Remove two unused variables

The patch 8f0bef6 refactored this script and made the variable $fh
unneeded in subs diff_applies and patch_update_file, but forgot to
remove them.

Signed-off-by: Thomas Badie <badie@lrde.epita.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-add--interactive.perl

@@ -1067,7 +1067,6 @@ sub edit_hunk_manually {
 }
 
 sub diff_applies {
-	my $fh;
 	return run_git_apply($patch_mode_flavour{APPLY_CHECK} . ' --check',
 			     map { @{$_->{TEXT}} } @_);
 }
@@ -1514,7 +1513,6 @@ sub patch_update_file {
 	}
 
 	if (@result) {
-		my $fh;
 		my @patch = reassemble_patch($head->{TEXT}, @result);
 		my $apply_routine = $patch_mode_flavour{APPLY};
 		&$apply_routine(@patch);