apparmor: fix typo "replace"

Signed-off-by: NZygmunt Krynicki <zygmunt.krynicki@canonical.com>
Acked-by: NChristian Boltz <apparmor@cboltz.de>
Signed-off-by: NJohn Johansen <john.johansen@canonical.com>

security/apparmor/label.c

@@ -2011,7 +2011,7 @@ static struct aa_label *labelset_next_stale(struct aa_labelset *ls)
 
 /**
  * __label_update - insert updated version of @label into labelset
- * @label - the label to update/repace
+ * @label - the label to update/replace
  *
  * Returns: new label that is up to date
  *     else NULL on failure