[openwrt/openwrt] ar71xx: remove obsolete '< KERNEL_VERSION(4, 2, 0)' check

[LEDE Commits]

jow pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/8f44c8086be7fd080f4ae2f6bbd5296482d99776

commit 8f44c8086be7fd080f4ae2f6bbd5296482d99776
Author: Gabor Juhos <juhosg at freemail.hu>
AuthorDate: Tue Jan 9 21:20:13 2018 +0100

    ar71xx: remove obsolete '< KERNEL_VERSION(4, 2, 0)' check
    
    Because the oldest supported kernel version on the ar71xx target is 4.4,
    the condition that the kernel version is smaller than 4.2.0 is always
    false. Remove the obsolete check from ag71xx_main.c to clean up the code
    a bit.
    
    Signed-off-by: Gabor Juhos <juhosg at freemail.hu>
---
 .../ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index 72dd654..93f8c53 100644
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -13,13 +13,6 @@
 
 #include "ag71xx.h"
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
-static inline void skb_free_frag(void *data)
-{
-	put_page(virt_to_head_page(data));
-}
-#endif
-
 #define AG71XX_DEFAULT_MSG_ENABLE	\
 	(NETIF_MSG_DRV			\
 	| NETIF_MSG_PROBE		\