fix errno

Author: Michael Agun

tests/end_to_end/end_to_end.cpp

@@ -955,7 +955,7 @@ negative_ring_buffer_test(ebpf_execution_type_t execution_type)
     // Calls to ring buffer APIs on this map (array_map) must fail.
     ebpf_ring_buffer_opts ring_opts{.sz = sizeof(ring_opts), .flags = EBPF_RINGBUF_FLAG_AUTO_CALLBACK};
     REQUIRE(ebpf_ring_buffer__new(map_fd, [](void*, void*, size_t) { return 0; }, nullptr, &ring_opts) == nullptr);
-    REQUIRE(libbpf_get_error(nullptr) == EINVAL);
+    REQUIRE(libbpf_get_error(nullptr) == -EINVAL);
     uint8_t data = 0;
     REQUIRE(ebpf_ring_buffer_map_write(map_fd, &data, sizeof(data)) == EBPF_INVALID_ARGUMENT);
 
@@ -4155,7 +4155,7 @@ negative_perf_buffer_test(ebpf_execution_type_t execution_type)
             [](void*, int, uint64_t) { return; },
             nullptr,
             &perf_opts) == nullptr);
-    REQUIRE(libbpf_get_error(nullptr) == EINVAL);
+    REQUIRE(libbpf_get_error(nullptr) == -EINVAL);
     uint8_t data = 0;
     REQUIRE(ebpf_perf_event_array_map_write(map_fd, &data, sizeof(data)) == EBPF_INVALID_ARGUMENT);
     bpf_object__close(unique_object.release());