hush: fix \<newline> handling

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-parsing/escape4.right b/shell/hush_test/hush-parsing/escape4.right
new file mode 100644
index 0000000..5de3e0c
--- /dev/null
+++ b/shell/hush_test/hush-parsing/escape4.right
@@ -0,0 +1,2 @@
+Ok
+End