tg3: Fix return ring size breakage

Commit f6eb9b1fc1, "tg3: Add 5717 asic
rev" changed how the rx return ring size operations are done.  It
effectively inverts the sense of the previous test, but it failed to
also invert the resulting sizes.  This patch corrects that error.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -112,7 +112,7 @@
  */
 #define TG3_RX_RCB_RING_SIZE(tp)	\
 	(((tp->tg3_flags & TG3_FLAG_JUMBO_CAPABLE) && \
-	  !(tp->tg3_flags2 & TG3_FLG2_5780_CLASS)) ? 512 : 1024)
+	  !(tp->tg3_flags2 & TG3_FLG2_5780_CLASS)) ? 1024 : 512)
 
 #define TG3_TX_RING_SIZE		512
 #define TG3_DEF_TX_RING_PENDING		(TG3_TX_RING_SIZE - 1)