[babl] extensions: u32<->float conversions in simple extension

[Øyvind Kolås <ok src gnome org>]

commit c00621ea91a2afe02a6e85f0b7bd9932346805ee
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Apr 7 17:01:08 2018 +0200

    extensions: u32<->float conversions in simple extension
    
    They were using 'float' rather than 'double' data types for intermediate values
    the lack of precision made the conversions be discarded by babl.

 extensions/simple.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/extensions/simple.c b/extensions/simple.c
index 1d8e750..9bd5d82 100644
--- a/extensions/simple.c
+++ b/extensions/simple.c
@@ -168,7 +168,7 @@ float_to_u32_x1 (const Babl *conversion,unsigned char *src_char, unsigned char *
   long n = samples;
   while (n--)
     {
-      float r = src[0];
+      double r = src[0];
             
       dst[0] = (r >= 1.0f) ? 0xFFFFFFFF : ((r <= 0.0f) ? 0x0 : 0xFFFFFFFF * r + 0.5f);
       
@@ -201,7 +201,7 @@ u32_to_float (const Babl *conversion,unsigned char *src_char, unsigned char *dst
   long n = samples;
   while (n--)
     {
-      dst[0] = src[0] / 4294967295.0f;
+      dst[0] = src[0] / 4294967295.0;
       dst ++;
       src ++;
     }