set the value of alloc_len properly again, as in DB's patch, in order to
avoid memory corruption problems


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2228 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
diff --git a/src/winio.c b/src/winio.c
index f04bd5a..d32403a 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -2288,7 +2288,7 @@
     assert(column <= start_col);
 
     alloc_len = display_string_len(buf + start_index, start_col,
-	start_col + COLS);
+	start_col + len) + 2;
     converted = charalloc(alloc_len + 1);
     index = 0;