[babl] tests: squelch clang warnings of using fabs on integer

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

commit f9009f8d9b29cf7d96f251bcfbdb8402298a76b5
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Nov 28 18:13:09 2019 +0100

    tests: squelch clang warnings of using fabs on integer

 tests/cairo_cmyk_hack.c | 2 +-
 tests/srgb_to_lab_u8.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/cairo_cmyk_hack.c b/tests/cairo_cmyk_hack.c
index 3e78aa7f1..1f308fe39 100644
--- a/tests/cairo_cmyk_hack.c
+++ b/tests/cairo_cmyk_hack.c
@@ -57,7 +57,7 @@ test (void)
 
   for (i = 0; i < PIXELS * 5; i++)
     {
-      if (fabs (dest_buf[i] - source_buf[i]) > TOLERANCE)
+      if (fabs (dest_buf[i] - source_buf[i] * 1.0) > TOLERANCE)
         {
           fprintf (stderr, "%i is wrong\n", i);
           OK = 0;
diff --git a/tests/srgb_to_lab_u8.c b/tests/srgb_to_lab_u8.c
index 2b0e6ad5f..b99538f11 100644
--- a/tests/srgb_to_lab_u8.c
+++ b/tests/srgb_to_lab_u8.c
@@ -53,7 +53,7 @@ test (void)
 
   for (i = 0; i < PIXELS * 3; i++)
     {
-      if (fabs (destination_buf[i] - reference_buf[i]) > TOLERANCE)
+      if (fabs (1.0 * destination_buf[i] - reference_buf[i]) > TOLERANCE)
         {
           fprintf (stderr, "%2i (%2i%%3=%i, %2i/3=%i) is %i should be %i",
                     i, i, i % 3, i, i / 3, destination_buf[i], reference_buf[i]);