patch 9.1.1270: missing out-of-memory checks in buffer.c

Problem:  missing out-of-memory checks in buffer.c
Solution: handle out-of-memory situations during allocation
          (John Marriott)

closes: #17031

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1270,
 /**/
     1269,
 /**/