patch 9.1.0271: CI sound test aborts with undefined variable

Problem:  CI sound test aborts with undefined variable
Solution: initialize g:result in test_sound.vim

closes: #14424

Signed-off-by:
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 5a005bd..3b33ab1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    271,
+/**/
     270,
 /**/
     269,