Add missing backslash

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12167 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/tests/Makefile.am b/helgrind/tests/Makefile.am
index b517815..f076ded 100644
--- a/helgrind/tests/Makefile.am
+++ b/helgrind/tests/Makefile.am
@@ -11,7 +11,7 @@
 	annotate_smart_pointer.vgtest annotate_smart_pointer.stdout.exp \
 		annotate_smart_pointer.stderr.exp \
 	cond_timedwait_invalid.vgtest cond_timedwait_invalid.stdout.exp \
-		cond_timedwait_invalid.stderr.exp
+		cond_timedwait_invalid.stderr.exp \
 	bar_bad.vgtest bar_bad.stdout.exp bar_bad.stderr.exp \
 	bar_trivial.vgtest bar_trivial.stdout.exp bar_trivial.stderr.exp \
 	free_is_write.vgtest free_is_write.stdout.exp \