[PATCH bpf-next] selftests/bpf: Fix const qualifier warning in fexit_bpf2bpf.c

[Varun R Mallya <varunrmallya@gmail.com>]

Building selftests with
clang 23.0.0 (6fae863eba8a72cdd82f37e7111a46a70be525e0) triggers
the following error:

  tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c:117:12:
  error: assigning to 'char *' from 'const char *' discards qualifiers
  [-Werror,-Wincompatible-pointer-types-discards-qualifiers]

The variable `tgt_name` is declared as `char *`, but it stores the
result of strstr(prog_name[i], "/"). Since `prog_name[i]` is a
`const char *`, the returned pointer should also be treated as
const-qualified.

Update `tgt_name` to `const char *` to match the type of the underlying
string and silence the compiler warning.

Signed-off-by: Varun R Mallya <varunrmallya@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
index 23d933f1aec6..92c20803ea76 100644
--- a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
@@ -111,7 +111,7 @@ static void test_fexit_bpf2bpf_common(const char *obj_file,
 		struct bpf_link_info link_info;
 		struct bpf_program *pos;
 		const char *pos_sec_name;
-		char *tgt_name;
+		const char *tgt_name;
 		__s32 btf_id;
 
 		tgt_name = strstr(prog_name[i], "/");
-- 
2.53.0