t2200,t9832: avoid using 'git' upstream in a pipe

Avoid placing `git` upstream in a pipe since doing so throws away
its exit code, thus an unexpected failure may go unnoticed.

Signed-off-by: Amanda Shafack <shafack.likhene@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t2200-add-update.sh

@@ -179,7 +179,8 @@ test_expect_success 'add -u resolves unmerged paths' '
 
 test_expect_success '"add -u non-existent" should fail' '
 	test_must_fail git add -u non-existent &&
-	! (git ls-files | grep "non-existent")
+	git ls-files >actual &&
+	! grep "non-existent" actual
 '
 
 test_done

t/t9832-unshelve.sh

@@ -68,7 +68,8 @@ EOF
 		cd "$git" &&
 		change=$(last_shelved_change) &&
 		git p4 unshelve $change &&
-		git show refs/remotes/p4-unshelved/$change | grep -q "Further description" &&
+		git show refs/remotes/p4-unshelved/$change >actual &&
+		grep -q "Further description" actual &&
 		git cherry-pick refs/remotes/p4-unshelved/$change &&
 		test_path_is_file file2 &&
 		test_cmp file1 "$cli"/file1 &&