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)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2178,
 /**/
     2177,
 /**/