selftests/bpf: fix double bpf_object__close() in veristate

bpf_object__close(obj) is called twice for BPF object files with single
BPF program in it. This causes crash. Fix this by not calling
bpf_object__close() unnecessarily.

Fixes: c8bc5e05 ("selftests/bpf: Add veristat tool for mass-verifying BPF object files")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220921164254.3630690-2-andrii@kernel.orgSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/veristat.c

@@ -300,7 +300,6 @@ static int process_obj(const char *filename)
 		prog = bpf_object__next_program(obj, NULL);
 		bpf_program__set_autoload(prog, true);
 		process_prog(filename, obj, prog);
-		bpf_object__close(obj);
 		goto cleanup;
 	}