[gnome-desktop] thumbnail: Fix typo in optional

[Bastien Nocera <hadess src gnome org>]

commit fdb6fd18da0535d1634f9d0cb6582d297181ec48
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Jul 11 11:13:20 2017 +0200

    thumbnail: Fix typo in optional

 libgnome-desktop/gnome-desktop-thumbnail.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgnome-desktop/gnome-desktop-thumbnail.c b/libgnome-desktop/gnome-desktop-thumbnail.c
index b774d13..18e4f8b 100644
--- a/libgnome-desktop/gnome-desktop-thumbnail.c
+++ b/libgnome-desktop/gnome-desktop-thumbnail.c
@@ -306,7 +306,7 @@ thumbnailer_try_exec (Thumbnailer *thumb)
   if (G_UNLIKELY (!thumb))
     return FALSE;
 
-  /* TryExec is optinal, but Exec isn't, so we assume
+  /* TryExec is optional, but Exec isn't, so we assume
    * the thumbnailer can be run when TryExec is not present
    */
   if (!thumb->try_exec)