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/enum.h b/drivers/net/sfc/enum.h
index c53290d..cec15db 100644
--- a/drivers/net/sfc/enum.h
+++ b/drivers/net/sfc/enum.h
@@ -52,12 +52,11 @@
 #define LOOPBACK_MASK(_efx)			\
 	(1 << (_efx)->loopback_mode)
 
-#define LOOPBACK_INTERNAL(_efx)						\
-	((LOOPBACKS_10G_INTERNAL & LOOPBACK_MASK(_efx)) ? 1 : 0)
+#define LOOPBACK_INTERNAL(_efx)				\
+	(!!(LOOPBACKS_10G_INTERNAL & LOOPBACK_MASK(_efx)))
 
-#define LOOPBACK_OUT_OF(_from, _to, _mask)		\
-	(((LOOPBACK_MASK(_from) & (_mask)) &&		\
-	  ((LOOPBACK_MASK(_to) & (_mask)) == 0)) ? 1 : 0)
+#define LOOPBACK_OUT_OF(_from, _to, _mask)				\
+	((LOOPBACK_MASK(_from) & (_mask)) && !(LOOPBACK_MASK(_to) & (_mask)))
 
 /*****************************************************************************/