selftests/bpf: Fix spelling mistake.

There is a spelling mistake in an ASSERT_OK literal string. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Mykola Lysenko <mykolal@fb.com>
Link: https://lore.kernel.org/r/20220817213242.101277-1-colin.i.king@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/prog_tests/kfunc_call.c

@@ -109,7 +109,7 @@ static void test_destructive(void)
 {
 	__u64 save_caps = 0;
 
-	ASSERT_OK(test_destructive_open_and_load(), "succesful_load");
+	ASSERT_OK(test_destructive_open_and_load(), "successful_load");
 
 	if (!ASSERT_OK(cap_disable_effective(1ULL << CAP_SYS_BOOT, &save_caps), "drop_caps"))
 		return;