conversion from double to fixed and back fails with certain values

[Micah Nordland]

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The value 3568.005 is not correctly converted back from fixed.
The following patch to tests/fixed-test.c demonstrates. Is this
expected behavior?

diff --git a/tests/fixed-test.c b/tests/fixed-test.c
index 739a3b1..89ec188 100644
- --- a/tests/fixed-test.c
+++ b/tests/fixed-test.c
@@ -65,6 +65,11 @@ TEST(fixed_double_conversions)
        d = wl_fixed_to_double(f);
        fprintf(stderr, "fixed %x to double %lf\n", f, d);
        assert(d == f / 256);
+
+    d = 3568.005;
+    f = wl_fixed_from_double(d);
+    fprintf(stderr, "fixed %x to double %lf\n", f, d);
+    assert(d == wl_fixed_to_double(f));
 }

 TEST(fixed_int_conversions)


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