t7810: correct --no-index test

GIT_CEILING_DIRECTORIES doesn't prevent chdir up into another directory
while looking for a repository directory if it is equal to the current
directory.  Because of this, the test which claims to test the git grep
--no-index command outside of a repository actually tests it inside of a
repository.  The test_must_fail assertions still pass because the git
grep only looks at untracked files and therefore no file matches, but
not because it's run outside of a repository as it was originally
intended.

Set the GIT_CEILING_DIRECTORIES environment variable to the parent
directory of the directory in which the git grep command is executed, to
make sure it is actually run outside of a git repository.

In addition, the && chain was broken in a couple of places in the same
test, fix that.

Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7810-grep.sh

@@ -791,12 +791,12 @@ test_expect_success 'outside of git repository' '
 	} >non/expect.full &&
 	echo file2:world >non/expect.sub &&
 	(
-		GIT_CEILING_DIRECTORIES="$(pwd)/non/git" &&
+		GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
 		export GIT_CEILING_DIRECTORIES &&
 		cd non/git &&
 		test_must_fail git grep o &&
 		git grep --no-index o >../actual.full &&
-		test_cmp ../expect.full ../actual.full
+		test_cmp ../expect.full ../actual.full &&
 		cd sub &&
 		test_must_fail git grep o &&
 		git grep --no-index o >../../actual.sub &&
@@ -805,7 +805,7 @@ test_expect_success 'outside of git repository' '
 
 	echo ".*o*" >non/git/.gitignore &&
 	(
-		GIT_CEILING_DIRECTORIES="$(pwd)/non/git" &&
+		GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
 		export GIT_CEILING_DIRECTORIES &&
 		cd non/git &&
 		test_must_fail git grep o &&
@@ -813,7 +813,7 @@ test_expect_success 'outside of git repository' '
 		test_cmp ../expect.full ../actual.full &&
 
 		{
-			echo ".gitignore:.*o*"
+			echo ".gitignore:.*o*" &&
 			cat ../expect.full
 		} >../expect.with.ignored &&
 		git grep --no-index --no-exclude o >../actual.full &&