[folks] tests: Upgrade a warning to an error

[Philip Withnall <pwithnall src gnome org>]

commit 1ecb3346985a0b155f074810da848a9de3b55770
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Fri Jan 23 12:58:34 2015 +0000

    tests: Upgrade a warning to an error
    
    If this fails, the test cannot complete successfully, so we might as
    well make sure the warning message doesn’t get buried by subsequent log
    output.

 tests/lib/test-utils.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/lib/test-utils.vala b/tests/lib/test-utils.vala
index 963d927..b09ef16 100644
--- a/tests/lib/test-utils.vala
+++ b/tests/lib/test-utils.vala
@@ -170,7 +170,7 @@ public class Folks.TestUtils
           catch (GLib.Error e1)
             {
               retval = false;
-              warning ("Failed to read loadable icon for comparison: %s",
+              error ("Failed to read loadable icon for comparison: %s",
                   e1.message);
             }
         }