[gnome-shell] private: Avoid unnecessary conversions in shadow computation

[Marco Trevisan <marcotrevi src gnome org>]

commit 2d79ab6c5c80ac3d145af44a4fb809b0a1f35bfe
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Oct 7 10:15:18 2017 +0200

    private: Avoid unnecessary conversions in shadow computation
    
    The type was changed from double to float for no apparent reason
    when moving code in commit 5060081db5f.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788627

 src/st/st-private.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/st/st-private.c b/src/st/st-private.c
index d62586068..be78833e7 100644
--- a/src/st/st-private.c
+++ b/src/st/st-private.c
@@ -247,7 +247,7 @@ blur_pixels (guchar  *pixels_in,
              gint    *rowstride_out)
 {
   guchar *pixels_out;
-  float   sigma;
+  gdouble sigma;
 
   /* The CSS specification defines (or will define) the blur radius as twice
    * the Gaussian standard deviation. See: