socket: Fix bug in osmo_sock_init2(AF_UNSPEC) matching IP versions

See previous commit for a bug description.

Fixes: 2c962f5de1eeea119cfac7d9d92db31c570353b9

Change-Id: I59bf4b4b3ed14766a5a5285923d1ffa9fc8b2294
diff --git a/tests/socket/socket_test.c b/tests/socket/socket_test.c
index 5cf20b7..ae77184 100644
--- a/tests/socket/socket_test.c
+++ b/tests/socket/socket_test.c
@@ -147,7 +147,7 @@
 	printf("Checking osmo_sock_init2(AF_UNSPEC) BIND on IPv4\n");
 	fd = osmo_sock_init2(AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "127.0.0.1", 0, NULL, 0,
 			     OSMO_SOCK_F_BIND);
-	OSMO_ASSERT(fd == -ENODEV); /* BUG! */
+	OSMO_ASSERT(fd >= 0);
 
 	talloc_free(name);