patch 9.0.1847: [security] potential oob write in do_addsub()

Problem:  potential oob write in do_addsub()
Solution: don't overflow buf2, check size in for loop()

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1847,
 /**/
     1846,
 /**/