ubifs: Add assert to dent_key_init()

...to make sure that we don't use it for double hashed lookups
instead of dent_key_init_hash().
Signed-off-by: NRichard Weinberger <richard@nod.at>

fs/ubifs/key.h

@@ -162,6 +162,7 @@ static inline void dent_key_init(const struct ubifs_info *c,
 	uint32_t hash = c->key_hash(fname_name(nm), fname_len(nm));
 
 	ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
+	ubifs_assert(!nm->hash && !nm->minor_hash);
 	key->u32[0] = inum;
 	key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
 }