patch 9.1.1387: memory leak when buflist_new() fails to reuse curbuf

Problem:  buflist_new() leaks ffname and fails to reuse curbuf when
          autocommands from buf_freeall change curbuf. Plus, a new
          buffer is not allocated in this case, despite what the comment
          above claims.
Solution: Remove the condition so ffname is not leaked and so a new
          buffer is allocated like before v8.2.4791. It should not be
          possible for undo_ftplugin or buf_freeall autocommands to
          delete the buffer as they set b_locked, but to stay consistent
          with other uses of buf_freeall, guard against that anyway
          (Sean Dewar).

Note that buf is set to NULL if it was deleted to guard against the (rare)
possibility of messing up the "buf != curbuf" condition below if a new buffer
happens to be allocated at the same address.

closes: #17319

Signed-off-by: Sean Dewar <6256228+seandewar@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 78a6e7b..7e6e862 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1387,
+/**/
     1386,
 /**/
     1385,