[babl] sse2-float: correctly handle associted alpha in remainder

[Øyvind "pippin" Kolås <ok src gnome org>]

commit debe24980e0e17758e3c88721455d58754856701
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jan 27 04:33:04 2022 +0100

    sse2-float: correctly handle associted alpha in remainder

 extensions/sse2-float.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/extensions/sse2-float.c b/extensions/sse2-float.c
index 3757ffe09..e4cd7cfac 100644
--- a/extensions/sse2-float.c
+++ b/extensions/sse2-float.c
@@ -157,11 +157,8 @@ conv_rgbAF_linear_rgbaF_linear_shuffle (const Babl  *conversion,
   while (remainder--)
     {
       float alpha = src[3];
-      float recip;
-      if (alpha <= 0.0f)
-        recip = 0.0f;
-      else
-        recip = 1.0f/alpha;
+      float used_alpha = babl_epsilon_for_zero_float (alpha);
+      float recip = 1.0f/used_alpha;
       dst[0] = src[0] * recip;
       dst[1] = src[1] * recip;
       dst[2] = src[2] * recip;