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/rx.h b/drivers/net/sfc/rx.h
index f35e377..187b110 100644
--- a/drivers/net/sfc/rx.h
+++ b/drivers/net/sfc/rx.h
@@ -24,6 +24,6 @@
 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue);
 void efx_rx_work(struct work_struct *data);
 void __efx_rx_packet(struct efx_channel *channel,
-		     struct efx_rx_buffer *rx_buf, int checksummed);
+		     struct efx_rx_buffer *rx_buf, bool checksummed);
 
 #endif /* EFX_RX_H */