patch 9.0.1260: Coverity warns for possible NULL pointer usage

Problem:    Coverity warns for possible NULL pointer usage.
Solution:   Change the condition.
diff --git a/src/version.c b/src/version.c
index 85fbc40..2324ff2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1260,
+/**/
     1259,
 /**/
     1258,