net: skbuff: Use ALIGN macro instead of open coding it

Use ALIGN from linux/kernel.h to define SKB_DATA_ALIGN instead of open
coding it.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -112,8 +112,7 @@
 #define CHECKSUM_COMPLETE	2
 #define CHECKSUM_PARTIAL	3
 
-#define SKB_DATA_ALIGN(X)	(((X) + (SMP_CACHE_BYTES - 1)) & \
-				 ~(SMP_CACHE_BYTES - 1))
+#define SKB_DATA_ALIGN(X)	ALIGN(X, SMP_CACHE_BYTES)
 #define SKB_WITH_OVERHEAD(X)	\
 	((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 #define SKB_MAX_ORDER(X, ORDER) \