Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/crypto/null.h b/include/crypto/null.h
index 15aeef6..0ef577c 100644
--- a/include/crypto/null.h
+++ b/include/crypto/null.h
@@ -9,7 +9,7 @@
 #define NULL_DIGEST_SIZE	0
 #define NULL_IV_SIZE		0
 
-struct crypto_skcipher *crypto_get_default_null_skcipher(void);
+struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void);
 void crypto_put_default_null_skcipher(void);
 
 #endif