patch 8.1.1833: allocating a bit too much when there is no bad word.

Problem:    Allocating a bit too much when spellbadword() does not find a bad
            word.
Solution:   Reset "len" when going to the next word. (Daniel Hahler,
            closes #4788)
diff --git a/src/version.c b/src/version.c
index adbf138..72dd651 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1833,
+/**/
     1832,
 /**/
     1831,