crypto: null - Get rid of crypto_{get,put}_default_null_skcipher2()

Since commit 499a66e6b689 ("crypto: null - Remove default null
blkcipher"), crypto_get_default_null_skcipher2() and
crypto_put_default_null_skcipher2() are the same as their non-2
equivalents.  So switch callers of the "2" versions over to the original
versions and remove the "2" versions.

Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c
index 9d73be2..87a27eb 100644
--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -469,7 +469,7 @@ static void *aead_bind(const char *name, u32 type, u32 mask)
 		return ERR_CAST(aead);
 	}
 
-	null_tfm = crypto_get_default_null_skcipher2();
+	null_tfm = crypto_get_default_null_skcipher();
 	if (IS_ERR(null_tfm)) {
 		crypto_free_aead(aead);
 		kfree(tfm);
@@ -487,7 +487,7 @@ static void aead_release(void *private)
 	struct aead_tfm *tfm = private;
 
 	crypto_free_aead(tfm->aead);
-	crypto_put_default_null_skcipher2();
+	crypto_put_default_null_skcipher();
 	kfree(tfm);
 }