fixed an error message

ChangeLog.unit-testing-framework

@@ -1,3 +1,7 @@
+2010-01-12  BVK Chaitanya  <bvk@dbook>
+
+	* tests/util/grub-shell-tester.in: Fix error message.
+
 2010-01-08  BVK Chaitanya  <bvk.groups@gmail.com>
 
 	Unit testing framework for GRUB.

tests/util/grub-shell-tester.in

@@ -98,7 +98,7 @@ bash ${source} >${outfile2}
 
 if ! diff -q ${outfile1} ${outfile2} >/dev/null
 then
-  echo "$1: GRUB and BASH outputs (${outfile1}, ${outfile2}) did not match"
+  echo "${source}: GRUB and BASH outputs did not match (see diff -u ${outfile1} ${outfile2})"
   status=1
 else
     rm -f ${outfile1} ${outfile2}