xfrm: policy: fix a spelling mistake

Fix a spelling mistake.
Signed-off-by: gushengxian <gushengxian@yulong.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_policy.c

@@ -3247,7 +3247,7 @@ xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x,
 
 /*
  * 0 or more than 0 is returned when validation is succeeded (either bypass
- * because of optional transport mode, or next index of the mathced secpath
+ * because of optional transport mode, or next index of the matched secpath
  * state with the template.
  * -1 is returned when no matching template is found.
  * Otherwise "-2 - errored_index" is returned.