remove extraneous doubled ;s

lib/dictBuilder/zdict.c

@@ -571,7 +571,7 @@ static void ZDICT_fillNoise(void* buffer, size_t length)
     unsigned const prime1 = 2654435761U;
     unsigned const prime2 = 2246822519U;
     unsigned acc = prime1;
-    size_t p=0;;
+    size_t p=0;
     for (p=0; p<length; p++) {
         acc *= prime2;
         ((unsigned char*)buffer)[p] = (unsigned char)(acc >> 21);