[NET] CORE: Fix whitespace errors.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/core/dev.c b/net/core/dev.c
index 6357f54c..38212c3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2629,7 +2629,7 @@
 		return;
 
 	if (!netif_device_present(dev))
-	        return;
+		return;
 
 	if (dev->set_rx_mode)
 		dev->set_rx_mode(dev);