patch 9.1.0195: memleak with ex_drop, NULL dereference

Problem:  memleak with ex_drop(), NULL dereference
          (zeertzjq)
Solution: revert back to ex_rewind(), use curbuf instead of buf

fixes: #14246
closes: #14251

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 8a80168..bb2980b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    195,
+/**/
     194,
 /**/
     193,