[vala/0.40] tests: Fix try_parse() tests to not compare to already free'd memory

[Rico Tzschichholz <ricotz src gnome org>]

commit e26deeb77a3508ef3d379ed2ecb865b60e48de7f
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Fri Jan 4 20:02:18 2019 +0100

    tests: Fix try_parse() tests to not compare to already free'd memory
    
    Found with valgrind

 tests/basic-types/integers.vala | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/tests/basic-types/integers.vala b/tests/basic-types/integers.vala
index 90618351d..1500ab266 100644
--- a/tests/basic-types/integers.vala
+++ b/tests/basic-types/integers.vala
@@ -91,17 +91,21 @@ void test_int () {
        assert (s == "42");
 
        unowned string unparsed;
+       s = "%lim".printf (long.MIN);
        long l;
-       long.try_parse ("%lim".printf (long.MIN), out l, out unparsed);
+       long.try_parse (s, out l, out unparsed);
        assert (l == long.MIN);
        assert (unparsed == "m");
-       assert (!long.try_parse ("%lum".printf (ulong.MAX), out l));
+       s = "%lum".printf (ulong.MAX);
+       assert (!long.try_parse (s, out l));
 
+       s = "%lum".printf (ulong.MAX);
        ulong ul;
-       ulong.try_parse ("%lum".printf (ulong.MAX), out ul, out unparsed);
+       ulong.try_parse (s, out ul, out unparsed);
        assert (ul == ulong.MAX);
        assert (unparsed == "m");
-       assert (!ulong.try_parse ("%lim".printf (long.MIN), out ul));
+       s = "%lim".printf (long.MIN);
+       assert (!ulong.try_parse (s, out ul));
 
        int64 i64;
        int64.try_parse ("-4711inch", out i64, out unparsed);