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 <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/gcm.c b/crypto/gcm.c
index 8589681..0ad879e 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -1101,7 +1101,7 @@
 	if (IS_ERR(aead))
 		return PTR_ERR(aead);
 
-	null = crypto_get_default_null_skcipher2();
+	null = crypto_get_default_null_skcipher();
 	err = PTR_ERR(null);
 	if (IS_ERR(null))
 		goto err_free_aead;
@@ -1129,7 +1129,7 @@
 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
 
 	crypto_free_aead(ctx->child);
-	crypto_put_default_null_skcipher2();
+	crypto_put_default_null_skcipher();
 }
 
 static void crypto_rfc4543_free(struct aead_instance *inst)