- Remove redundant assertions that the driver lock is not held in attach()

and detach() since mtx_lock() will assert that already since the driver
  lock is not recursive.
- Move the call to callout_init_mtx() before hme_stop() so that the
  callout_stop() in hme_stop() doesn't operate on an uninitialized callout
  structure during attach.

Reported by:	yongari (2)
MFC after:	3 days

sys/dev/hme/if_hme.c

@@ -199,14 +199,13 @@ hme_config(struct hme_softc *sc)
 	 *
 	 */
 
-	HME_LOCK_ASSERT(sc, MA_NOTOWNED);
+	callout_init_mtx(&sc->sc_tick_ch, &sc->sc_lock, 0);
+
 	/* Make sure the chip is stopped. */
 	HME_LOCK(sc);
 	hme_stop(sc);
 	HME_UNLOCK(sc);
 
-	callout_init_mtx(&sc->sc_tick_ch, &sc->sc_lock, 0);
-
 	/*
 	 * Allocate DMA capable memory
 	 * Buffer descriptors must be aligned on a 2048 byte boundary;
@@ -381,8 +380,6 @@ hme_detach(struct hme_softc *sc)
 	struct ifnet *ifp = sc->sc_ifp;
 	int i;
 
-	HME_LOCK_ASSERT(sc, MA_NOTOWNED);
-
 	ether_ifdetach(ifp);
 	if_free(ifp);
 	HME_LOCK(sc);