selftests/bpf: Add missing line break in test_verifier

There are no break lines in the test log for test_verifier #106 ~ #111
if jit is disabled, add the missing line break at the end of printf()
to fix it.

Without this patch:

  [root@linux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
  [root@linux bpf]# ./test_verifier 106
  #106/p inline simple bpf_loop call SKIP (requires BPF JIT)Summary: 0 PASSED, 1 SKIPPED, 0 FAILED

With this patch:

  [root@linux bpf]# echo 0 > /proc/sys/net/core/bpf_jit_enable
  [root@linux bpf]# ./test_verifier 106
  #106/p inline simple bpf_loop call SKIP (requires BPF JIT)
  Summary: 0 PASSED, 1 SKIPPED, 0 FAILED

Fixes: 0b50478f ("selftests/bpf: Skip callback tests if jit is disabled in test_verifier")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240126015736.655-1-yangtiezhu@loongson.cn

tools/testing/selftests/bpf/test_verifier.c

@@ -1527,7 +1527,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	int i, err;
 
 	if ((test->flags & F_NEEDS_JIT_ENABLED) && jit_disabled) {
-		printf("SKIP (requires BPF JIT)");
+		printf("SKIP (requires BPF JIT)\n");
 		skips++;
 		sched_yield();
 		return;