patch 9.1.1181: Unnecessary STRLEN() calls in insexpand.c

Problem:  Unnecessary STRLEN() calls in insexpand.c (after 9.1.1178).
Solution: Use the already available length (zeertzjq).

closes: #16814

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 0592d80..ad0cbcc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1181,
+/**/
     1180,
 /**/
     1179,