ash,hush: handle a few more bkslash-newline cases

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-parsing/bkslash_newline2.tests b/shell/hush_test/hush-parsing/bkslash_newline2.tests
new file mode 100755
index 0000000..47d6304
--- /dev/null
+++ b/shell/hush_test/hush-parsing/bkslash_newline2.tests
@@ -0,0 +1,4 @@
+echo Line with one backslash:
+echo '\
+'
+echo Ok:$?