[babl] palette: allow a NULL space in babl_new_palette_with_space()

[Michael Natterer <mitch src gnome org>]

commit ce2d1d4e5c9fc001df5334fef0d1504e0da1b629
Author: Michael Natterer <mitch gimp org>
Date:   Tue Jan 1 19:15:40 2019 +0100

    palette: allow a NULL space in babl_new_palette_with_space()

 babl/babl-palette.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/babl/babl-palette.c b/babl/babl-palette.c
index a53f654..d03ad1d 100644
--- a/babl/babl-palette.c
+++ b/babl/babl-palette.c
@@ -727,6 +727,9 @@ const Babl *babl_new_palette_with_space (const char  *name,
 
   char  cname[64];
 
+  if (!space)
+    space = babl_space ("sRGB");
+
   if (!name)
     {
       static int cnt = 0;
@@ -873,7 +876,7 @@ const Babl *babl_new_palette (const char  *name,
                               const Babl **format_u8,
                               const Babl **format_u8_with_alpha)
 {
-  return babl_new_palette_with_space (name, babl_space("sRGB"),
+  return babl_new_palette_with_space (name, NULL,
                                       format_u8, format_u8_with_alpha);
 }