samples/bpf: Remove unused variables in tc_l2_redirect_kern.c

These variables are never referenced in the code, just remove them.

Signed-off-by: Zhu Jun <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

samples/bpf/tc_l2_redirect_kern.c

···
 	void *data_end = (void *)(long)skb->data_end;
 	int key = 0, *ifindex;
 
-	int ret;
-
 	if (data + sizeof(*eth) > data_end)
 		return TC_ACT_OK;
 
···
 	struct eth_hdr *eth = data;
 	void *data_end = (void *)(long)skb->data_end;
 	int key = 0, *ifindex;
-
-	int ret;
 
 	if (data + sizeof(*eth) > data_end)
 		return TC_ACT_OK;