tg3: Reduce indent level of tg3_rx_prodring_alloc

This patch adds an inverted "jumbo ring enable" test and jumps to the exit
if it succeeds.  The change reduces the indent level of the remaining
code making it more readable.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -6087,7 +6087,9 @@ static int tg3_rx_prodring_alloc(struct tg3 *tp,
 
 	memset(tpr->rx_jmb, 0, TG3_RX_JUMBO_RING_BYTES);
 
-	if (tp->tg3_flags & TG3_FLAG_JUMBO_RING_ENABLE) {
+	if (!(tp->tg3_flags & TG3_FLAG_JUMBO_RING_ENABLE))
+		goto done;
+
 	for (i = 0; i < TG3_RX_JUMBO_RING_SIZE; i++) {
 		struct tg3_rx_buffer_desc *rxd;
 
@@ -6100,8 +6102,7 @@ static int tg3_rx_prodring_alloc(struct tg3 *tp,
 	}
 
 	for (i = 0; i < tp->rx_jumbo_pending; i++) {
-			if (tg3_alloc_rx_skb(tp, tpr, RXD_OPAQUE_RING_JUMBO,
-					     i) < 0) {
+		if (tg3_alloc_rx_skb(tp, tpr, RXD_OPAQUE_RING_JUMBO, i) < 0) {
 			printk(KERN_WARNING PFX
 			       "%s: Using a smaller RX jumbo ring, "
 			       "only %d out of %d buffers were "
@@ -6113,7 +6114,6 @@ static int tg3_rx_prodring_alloc(struct tg3 *tp,
 			break;
 		}
 	}
-	}
 
 done:
 	return 0;