[][openwrt][mt7988][tops][fix coverity issue]

[Description]
Fix TOPS coverity issue

[Release-log]
N/A

Change-Id: Ic4a5aaf30e66e7985ef3d13e7448a626ee8ba124
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7922988
diff --git a/package-21.02/kernel/tops/src/tnl_offload.c b/package-21.02/kernel/tops/src/tnl_offload.c
index c989054..aa19f75 100644
--- a/package-21.02/kernel/tops/src/tnl_offload.c
+++ b/package-21.02/kernel/tops/src/tnl_offload.c
@@ -123,9 +123,7 @@
 
 static inline bool skb_tops_valid(struct sk_buff *skb)
 {
-	return (skb
-		&& skb_hnat_tops(skb) >= 0
-		&& skb_hnat_tops(skb) <= __TOPS_ENTRY_MAX);
+	return (skb && skb_hnat_tops(skb) <= __TOPS_ENTRY_MAX);
 }
 
 static inline struct tops_tnl_type *skb_to_tnl_type(struct sk_buff *skb)