[gegl] posterize: use float argument in property chant

[Øyvind Kolås <ok src gnome org>]

commit 3703e8c85b450209bdb217b71a75ea9eb667fc5c
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri May 16 21:51:43 2014 +0200

    posterize: use float argument in property chant

 operations/common/posterize.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/posterize.c b/operations/common/posterize.c
index 57cfe22..c10a188 100644
--- a/operations/common/posterize.c
+++ b/operations/common/posterize.c
@@ -24,7 +24,7 @@
 gegl_property_int (levels, "nick", _("Levels"),
     "blurb", _("number of levels per component"),
     "default", 8, "min",    1,  "max",      64,
-    "ui-min",  1, "ui-max", 64, "ui-gamma", 2,
+    "ui-min",  1, "ui-max", 64, "ui-gamma", 2.0,
     NULL)
 
 #else