kaccak: remove unused return value

src/crypto/keccak.c

@@ -75,7 +75,7 @@ void keccakf(uint64_t st[25], int rounds)
 // compute a keccak hash (md) of given byte length from "in"
 typedef uint64_t state_t[25];
 
-int keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
+void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
 {
     state_t st;
     uint8_t temp[144];
@@ -116,8 +116,6 @@ int keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
     keccakf(st, KECCAK_ROUNDS);
 
     memcpy(md, st, mdlen);
-
-    return 0;
 }
 
 void keccak1600(const uint8_t *in, size_t inlen, uint8_t *md)

src/crypto/keccak.h

@@ -16,7 +16,7 @@
 #endif
 
 // compute a keccak hash (md) of given byte length from "in"
-int keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen);
+void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen);
 
 // update the state
 void keccakf(uint64_t st[25], int norounds);

tests/unit_tests/crypto.cpp

@@ -74,16 +74,12 @@ namespace
   {
     size_t inlen = sizeof(source);
     int mdlen = (int)sizeof(md);
-    int ret = keccak(source, inlen, md, mdlen);
+    keccak(source, inlen, md, mdlen);
 
     if (md[0] != 0x00)
     {
         return true;
     }
-    else if (!ret)
-    {
-        return true;
-    }
     else
     {
         return false;