sfxge: plug set-but-not-used vars

Sponsored by:	Rubicon Communications, LLC ("Netgate")

sys/dev/sfxge/common/efx_mcdi.c

@@ -1179,7 +1179,11 @@ efx_mcdi_read_assertion(
 	efx_mcdi_req_t req;
 	EFX_MCDI_DECLARE_BUF(payload, MC_CMD_GET_ASSERTS_IN_LEN,
 		MC_CMD_GET_ASSERTS_OUT_LEN);
+#ifdef KDTRACE_HOOKS
 	const char *reason;
+#else
+	const char *reason __unused;
+#endif
 	unsigned int flags;
 	unsigned int index;
 	unsigned int ofst;

sys/dev/sfxge/common/siena_phy.c

@@ -586,6 +586,7 @@ siena_phy_stats_update(
 	siena_phy_decode_stats(enp, vmask, esmp, &smask, stat);
 	EFSYS_ASSERT(smask == encp->enc_phy_stat_mask);
 
+	(void)rc; /* XXX? */
 	return (0);
 
 fail2: