test-socket-netlink: print the proper expected string

We would use the return value from the tested function to decide
what to print as "expected", which is confusing when something is wrong
with the tested function.

src/test/test-socket-netlink.c

@@ -12,11 +12,19 @@ static void test_socket_address_parse_one(const char *in, int ret, int family, c
         int r;
 
         r = socket_address_parse(&a, in);
-        if (r >= 0)
-                assert_se(socket_address_print(&a, &out) >= 0);
+        if (r >= 0) {
+                r = socket_address_print(&a, &out);
+                if (r < 0)
+                        log_error_errno(r, "Printing failed for \"%s\": %m", in);
+                assert(r >= 0);
+        }
 
-        log_info("\"%s\" → %s → \"%s\" (expect \"%s\")", in,
-                 r >= 0 ? "✓" : "✗", empty_to_dash(out), r >= 0 ? expected ?: in : "-");
+        log_info("\"%s\" → %s %d → \"%s\" (expect %d / \"%s\")",
+                 in,
+                 r >= 0 ? "✓" : "✗", r,
+                 empty_to_dash(out),
+                 ret,
+                 ret >= 0 ? expected ?: in : "-");
         assert_se(r == ret);
         if (r >= 0) {
                 assert_se(a.sockaddr.sa.sa_family == family);