S2io: two branches the same in wait_for_cmd_complete()

Fix check to verify if a register bit is set. We have not hit this bug because
wait_for_cmd_complete() is always called with S2IO_BIT_RESET. 
Reported by Roel Kluin <roel.kluin@gmail.com>.

Signed-off-by: Ram Vepa <ram.vepa@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/s2io.c

@@ -3421,7 +3421,7 @@ static int wait_for_cmd_complete(void __iomem *addr, u64 busy_bit,
 				break;
 			}
 		} else {
-			if (!(val64 & busy_bit)) {
+			if (val64 & busy_bit) {
 				ret = SUCCESS;
 				break;
 			}