S2IO: Removing 3 buffer mode support from the driver

 - Removed 3 buffer mode support from driver - unused feature
 - Incorporated Jeff Garzik's comments on elimination of inline typecasting
 - Code cleanup : Removed a few extra spaces
Signed-off-by: Veena Parat <veena.parat@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/s2io.h

@@ -575,8 +575,7 @@ struct RxD_block {
 #define SIZE_OF_BLOCK	4096
 
 #define RXD_MODE_1	0 /* One Buffer mode */
-#define RXD_MODE_3A	1 /* Three Buffer mode */
-#define RXD_MODE_3B	2 /* Two Buffer mode */
+#define RXD_MODE_3B	1 /* Two Buffer mode */
 
 /* Structure to hold virtual addresses of Buf0 and Buf1 in
  * 2buf mode. */