patch 8.0.1622: possible NULL pointer dereference

Problem:    Possible NULL pointer dereferencey. (Coverity)
Solution:   Reverse the check for a NULL pointer.

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1622,
 /**/
     1621,
 /**/