[pygobject] Don't use == to compare doubles, use <= and =>.

[Tomeu Vizoso <tomeuv src gnome org>]

commit 7e9cbd5601ad548b78d106bac1a1576d33b91c65
Author: Simon van der Linden <svdlinden gnome org>
Date:   Mon Jul 26 17:00:23 2010 +0200

    Don't use == to compare doubles, use <= and =>.
    
    This avoids inequality due to small precisions difference.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=625326

 tests/testhelpermodule.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/testhelpermodule.c b/tests/testhelpermodule.c
index 21679bc..5585c96 100644
--- a/tests/testhelpermodule.c
+++ b/tests/testhelpermodule.c
@@ -447,7 +447,7 @@ test4_callback (GObject *object,
   g_return_if_fail (b == TRUE);
   g_return_if_fail (l == 10L);
   g_return_if_fail (f <= 3.14001 && f >= 3.13999);
-  g_return_if_fail (d == 1.78);
+  g_return_if_fail (d <= 1.78001 && d >= 1.77999);
   g_return_if_fail (uint == 20);
   g_return_if_fail (ulong == 30L);
 }