[babl] do not print missing fast path message when tolerance is very small

[Øyvind Kolås <ok src gnome org>]

commit 655bd1275ca1f4fb39d80fad9c392b942d7c77b2
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Mar 15 22:36:12 2017 +0100

    do not print missing fast path message when tolerance is very small
    
    During the build of examples for GEGL when hashes are being cheched, the
    BABL_TOLERANCE is set to 0.0 on purpose. Complaints about missing fast-paths
    here are noise.

 babl/babl-fish-path.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/babl/babl-fish-path.c b/babl/babl-fish-path.c
index 4f169d0..77671ff 100644
--- a/babl/babl-fish-path.c
+++ b/babl/babl-fish-path.c
@@ -352,8 +352,12 @@ babl_fish_path (const Babl *source,
 #endif
       {
         static int warnings = 0;
+
+        if (_babl_legal_error() <= 0.0000000001)
+            return NULL;
+
         if (warnings++ == 0)
-          fprintf (stderr, 
+          fprintf (stderr,
 "Missing fast-path babl conversion detected, Implementing missing babl fast paths\n"
 "accelerates GEGL, GIMP and other software using babl, warnings are printed on\n"
 "first occurance of formats used where a conversion has to be synthesized\n"