5253 kmem_alloc/kmem_zalloc won't fail with KM_SLEEP
5254 getrbuf won't fail with KM_SLEEP

@@ -102,12 +102,10 @@
 tkip_attach(struct ieee80211com *ic, struct ieee80211_key *k)
 {
         struct tkip_ctx *ctx;
 
         ctx = kmem_zalloc(sizeof (struct tkip_ctx), KM_SLEEP);
-        if (ctx == NULL)
-                return (NULL);
 
         ctx->tc_ic = ic;
         return (ctx);
 }