sfc: Use explicit bool for boolean variables, parameters and return values

Replace (cond ? 1 : 0) with cond or !!cond as appropriate, and
(cond ? 0 : 1) with !cond.

Remove some redundant boolean temporaries.

Rename one field that looks like a flag but isn't.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/sfc/falcon.h b/drivers/net/sfc/falcon.h
index 492f9bc..a72f50e 100644
--- a/drivers/net/sfc/falcon.h
+++ b/drivers/net/sfc/falcon.h
@@ -65,7 +65,7 @@
 extern void falcon_remove_port(struct efx_nic *efx);
 
 /* MAC/PHY */
-extern int falcon_xaui_link_ok(struct efx_nic *efx);
+extern bool falcon_xaui_link_ok(struct efx_nic *efx);
 extern int falcon_dma_stats(struct efx_nic *efx,
 			    unsigned int done_offset);
 extern void falcon_drain_tx_fifo(struct efx_nic *efx);