patch 7.4.2257

Problem:    Coverity complains about not checking for NULL.
Solution:   Check for out of memory.

src/version.c

@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2257,
 /**/
     2256,
 /**/