[gtk+] testsuite/gtk/textiter: Add missing assertion

[Daniel Boles <dboles src gnome org>]

commit 397bced61bb444b893a96e635de4e7b310816443
Author: Daniel Boles <dboles src gnome org>
Date:   Sat Feb 18 20:18:05 2017 +0000

    testsuite/gtk/textiter: Add missing assertion
    
    gboolean ret for whether gtk_text_iter_backward_line() moved the iter
    was declared but not used anywhere. I presume it was meant to be
    checked, and it passes now, so let’s do it.

 testsuite/gtk/textiter.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/testsuite/gtk/textiter.c b/testsuite/gtk/textiter.c
index c68220c..a743903 100644
--- a/testsuite/gtk/textiter.c
+++ b/testsuite/gtk/textiter.c
@@ -772,7 +772,8 @@ test_backward_line (void)
      and move &iter to start of the line, or return FALSE if &iter
      was already at start of the line, so in both cases &iter should
      be at the start of the line, so check that */
-  gtk_text_iter_backward_line (&iter);
+  ret = gtk_text_iter_backward_line (&iter);
+  g_assert_true (ret);
   offset = gtk_text_iter_get_line_offset (&iter);
   g_assert_cmpint (offset, ==, 0);