[gegl] tests: in test-compression, *actually* return a failure status when failing

[Ell <ell src gnome org>]

commit 509d1746136c60c26e4d468a7858fc5ff2f3ee42
Author: Ell <ell_se yahoo com>
Date:   Tue Dec 18 10:46:46 2018 -0500

    tests: in test-compression, *actually* return a failure status when failing
    
    Dunno, this sounds like a good idea :P

 tests/simple/test-compression.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/tests/simple/test-compression.c b/tests/simple/test-compression.c
index 93baefd3b..dda0ae57f 100644
--- a/tests/simple/test-compression.c
+++ b/tests/simple/test-compression.c
@@ -159,6 +159,8 @@ main (gint    argc,
 
 fail:
       printf ("FAIL\n");
+
+      result = FAILURE;
     }
 
   g_free (algorithms);