update test to print error from EnumerateChildren

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

test/sharness/t0081-repo-pinning.sh

@@ -240,7 +240,7 @@ test_expect_success "some are no longer there" '
 test_expect_success "recursive pin fails without objects" '
 	ipfs pin rm -r=false "$HASH_DIR1" &&
 	test_must_fail ipfs pin add -r "$HASH_DIR1" 2>err_expected8 &&
-	grep "pin: failed to fetch all nodes" err_expected8 ||
+	grep "pin: merkledag: not found" err_expected8 ||
 	test_fsh cat err_expected8
 '