selftests/bpf: Add negative test cases for snprintf

JIRA: https://issues.redhat.com/browse/RHEL-110274

commit bf4807c
Author: Paul Chaignon <paul.chaignon@gmail.com>
Date:   Tue Jul 1 21:48:03 2025 +0200

    selftests/bpf: Add negative test cases for snprintf
    
    This patch adds a couple negative test cases with a trailing % at the
    end of the format string. The %p% case was fixed by the previous commit,
    whereas the %s% case was already successfully rejected before.
    
    Acked-by: Yonghong Song <yonghong.song@linux.dev>
    Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
    Link: https://lore.kernel.org/r/0669bf6eb4f9e5bb10e949d60311c06e2d942447.1751395489.git.paul.chaignon@gmail.com
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>
    

Signed-off-by: Viktor Malik <vmalik@redhat.com>

Author: viktormalik

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

@@ -116,6 +116,8 @@ static void test_snprintf_negative(void)
 	ASSERT_ERR(load_single_snprintf("%llc"), "invalid specifier 7");
 	ASSERT_ERR(load_single_snprintf("\x80"), "non ascii character");
 	ASSERT_ERR(load_single_snprintf("\x1"), "non printable character");
+	ASSERT_ERR(load_single_snprintf("%p%"), "invalid specifier 8");
+	ASSERT_ERR(load_single_snprintf("%s%"), "invalid specifier 9");
 }
 
 void test_snprintf(void)