selftests/bpf: Avoid duplicate btf__parse() call

btf__parse() is repeated after successful setup, leaving the first
instance leaked. Remove redundant and premature call.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com>
Link: https://lore.kernel.org/bpf/20211107165521.9240-8-andrii@kernel.org

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

@@ -433,7 +433,7 @@ static int setup_type_id_case_local(struct core_reloc_test_case *test)
 
 static int setup_type_id_case_success(struct core_reloc_test_case *test) {
 	struct core_reloc_type_id_output *exp = (void *)test->output;
-	struct btf *targ_btf = btf__parse(test->btf_src_file, NULL);
+	struct btf *targ_btf;
 	int err;
 
 	err = setup_type_id_case_local(test);