jffs2: fix IN_DELETE_SELF on overwriting rename() killing a directory

We don't generate IN_DELETE_SELF on victim of overwriting rename() if
it happens to be a directory.  Trivially fixed by doing to ->i_nlink
what we do ->pino_nlink a couple of lines later in jffs2_rename().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 8f40ce4..5f243cd 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -820,7 +820,10 @@
 
 	if (victim_f) {
 		/* There was a victim. Kill it off nicely */
-		drop_nlink(new_dentry->d_inode);
+		if (S_ISDIR(new_dentry->d_inode->i_mode))
+			clear_nlink(new_dentry->d_inode);
+		else
+			drop_nlink(new_dentry->d_inode);
 		/* Don't oops if the victim was a dirent pointing to an
 		   inode which didn't exist. */
 		if (victim_f->inocache) {