[ostree] tests: Ensure we quote grep pattern

[Colin Walters <walters src gnome org>]

commit a2872749354e91b67661908f909e2e0128c78d74
Author: Colin Walters <walters verbum org>
Date:   Sun Dec 18 17:35:30 2011 -0500

    tests: Ensure we quote grep pattern
    
    Otherwise we fail if the pattern starts with -

 tests/libtest.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/libtest.sh b/tests/libtest.sh
index 04e206b..b6e57a1 100644
--- a/tests/libtest.sh
+++ b/tests/libtest.sh
@@ -55,7 +55,7 @@ assert_not_has_file () {
 }
 
 assert_file_has_content () {
-    if ! grep -q "$2" "$1"; then
+    if ! grep -q -e "$2" "$1"; then
 	echo 1>&2 "File '$1' doesn't match regexp '$2'"; exit 1
     fi
 }