patch 8.2.3391: crash with combination of 'linebreak' and other options

Problem:    Crash with combination of 'linebreak' and other options.
Solution:   Avoid n_extra to become negative. (Christian Brabandt,
            closes #8817)
diff --git a/src/version.c b/src/version.c
index ce649e0..b574d5d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3391,
+/**/
     3390,
 /**/
     3389,