patch 8.1.2178: accessing uninitialized memory in test

Problem:    Accessing uninitialized memory in test.
Solution:   Check if there was a match before using the match position.
            (Dominique Pelle, closes #5088)
diff --git a/src/version.c b/src/version.c
index f96160e..6a58b3d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2178,
+/**/
     2177,
 /**/
     2176,