sfxge(4): translate MC_CMD_ERR_ERANGE to host errno value

This is needed because MCDI command MC_CMD_REKEY can return
MC_CMD_ERR_ERANGE.

Submitted by:   Tom Millington <tmillington at solarflare.com>
Sponsored by:   Solarflare Communications, Inc.
MFC after:      2 days

sys/dev/sfxge/common/efx_mcdi.c

@@ -646,6 +646,8 @@ efx_mcdi_request_errcode(
 	case MC_CMD_ERR_ENOSPC:
 		return (ENOSPC);
 #endif
+	case MC_CMD_ERR_ERANGE:
+		return (ERANGE);
 
 	case MC_CMD_ERR_ALLOC_FAIL:
 		return (ENOMEM);