update blake2 reference impl file (cosmetic)

only whitespace changes.

(cherry picked from commit b56f6cdbc0263572cac932ae248580392b5cf20b)

src/borg/algorithms/blake2/ref/blake2-impl.h

@@ -1,14 +1,14 @@
 /*
    BLAKE2 reference source code package - reference C implementations
-  
+
    Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
    terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
    your option.  The terms of these licenses can be found at:
-  
+
    - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
    - OpenSSL license   : https://www.openssl.org/source/license.html
    - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
-  
+
    More information about the BLAKE2 hash function can be found at
    https://blake2.net.
 */
@@ -158,4 +158,3 @@ static BLAKE2_INLINE void secure_zero_memory(void *v, size_t n)
 }
 
 #endif
-

src/borg/algorithms/blake2/ref/blake2.h

@@ -193,4 +193,3 @@ extern "C" {
 #endif
 
 #endif
-

src/borg/algorithms/blake2/ref/blake2b-ref.c

@@ -1,14 +1,14 @@
 /*
    BLAKE2 reference source code package - reference C implementations
-  
+
    Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.  You may use this under the
    terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
    your option.  The terms of these licenses can be found at:
-  
+
    - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
    - OpenSSL license   : https://www.openssl.org/source/license.html
    - Apache 2.0        : http://www.apache.org/licenses/LICENSE-2.0
-  
+
    More information about the BLAKE2 hash function can be found at
    https://blake2.net.
 */
@@ -377,4 +377,3 @@ fail:
   return -1;
 }
 #endif
-