patch 9.0.1286: Coverity warns for using a NULL pointer

Problem:    Coverity warns for using a NULL pointer.
Solution:   Bail out whan "varp" is NULL.
diff --git a/src/version.c b/src/version.c
index 7c85a97..439698b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1286,
+/**/
     1285,
 /**/
     1284,