[babl] babl: use floating point version of srgb trc func

[Øyvind Kolås <ok src gnome org>]

commit 3961a53094bdaddee896f042462ed45fdcd9a525
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Aug 31 17:27:20 2017 +0200

    babl: use floating point version of srgb trc func

 babl/babl-trc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/babl/babl-trc.c b/babl/babl-trc.c
index 29c56db..9275cb6 100644
--- a/babl/babl-trc.c
+++ b/babl/babl-trc.c
@@ -470,7 +470,7 @@ static inline float _babl_trc_gamma_2_2_from_linear (const Babl *trc_, float x)
 
 static inline float _babl_trc_srgb_to_linear (const Babl *trc_, float value)
 {
-  return babl_gamma_2_2_to_linear (value);
+  return babl_gamma_2_2_to_linearf (value);
 }
 
 static inline float _babl_trc_srgb_from_linear (const Babl *trc_, float value)