smb: client: get rid of d_drop()+d_add()

smb: client: get rid of d_drop()+d_add()

Replace d_drop()+d_add() in cifs_tmpfile() and cifs_create() with
d_instantiate(), and in cifs_atomic_open() with d_splice_alias() if
in-lookup, otherwise d_instantiate().

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Closes: https://lore.kernel.org/r/20260408065719.GF3836593@ZenIV
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Cc: David Howells <dhowells@redhat.com>
Cc: NeilBrown <neilb@ownmail.net>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>