selftests/bpf: Remove unused variable from bpf_sk_assign test

Was never used in bpf_sk_assign_test(), and was removed from handle_{tcp,udp}()
in commit 0b9ad56b ("selftests/bpf: Use SOCKMAP for server sockets in
bpf_sk_assign test").

Fixes: 0b9ad56b ("selftests/bpf: Use SOCKMAP for server sockets in bpf_sk_assign test")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220329154914.3718658-1-eyal.birger@gmail.com

tools/testing/selftests/bpf/progs/test_sk_assign.c

@@ -89,7 +89,6 @@ get_tuple(struct __sk_buff *skb, bool *ipv4, bool *tcp)
 static inline int
 handle_udp(struct __sk_buff *skb, struct bpf_sock_tuple *tuple, bool ipv4)
 {
-	struct bpf_sock_tuple ln = {0};
 	struct bpf_sock *sk;
 	const int zero = 0;
 	size_t tuple_len;
@@ -121,7 +120,6 @@ handle_udp(struct __sk_buff *skb, struct bpf_sock_tuple *tuple, bool ipv4)
 static inline int
 handle_tcp(struct __sk_buff *skb, struct bpf_sock_tuple *tuple, bool ipv4)
 {
-	struct bpf_sock_tuple ln = {0};
 	struct bpf_sock *sk;
 	const int zero = 0;
 	size_t tuple_len;
@@ -161,7 +159,7 @@ handle_tcp(struct __sk_buff *skb, struct bpf_sock_tuple *tuple, bool ipv4)
 SEC("tc")
 int bpf_sk_assign_test(struct __sk_buff *skb)
 {
-	struct bpf_sock_tuple *tuple, ln = {0};
+	struct bpf_sock_tuple *tuple;
 	bool ipv4 = false;
 	bool tcp = false;
 	int tuple_len;