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>
diff --git a/src/version.c b/src/version.c
index 5cde7c1..c638a10 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1847,
+/**/
     1846,
 /**/
     1845,