[epiphany] Fix unused variable warning

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9ee63e742d9a1aaf9ed8ca673be097317a1911ce
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Nov 2 05:25:31 2018 -0500

    Fix unused variable warning

 src/window-commands.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/window-commands.c b/src/window-commands.c
index 177af0924..9b82fc6c6 100644
--- a/src/window-commands.c
+++ b/src/window-commands.c
@@ -2366,11 +2366,10 @@ window_cmd_tabs_close_left (GSimpleAction *action,
   EphyWindow *window = user_data;
   GtkWidget *notebook;
   EphyEmbed *embed;
-  int n_pages, current_page_no;
+  int current_page_no;
   GSList *pages_to_close = NULL;
 
   notebook = ephy_window_get_notebook (window);
-  n_pages = gtk_notebook_get_n_pages (GTK_NOTEBOOK (notebook));
   current_page_no = gtk_notebook_get_current_page (GTK_NOTEBOOK (notebook));
 
   for (int i = 0; i < current_page_no; i++) {