xorshift minor tweaks

C/samples.c

@@ -167,7 +167,7 @@ void mixture(float (*samplers[])(uint32_t*), float* weights, int n_dists, float*
     uint32_t** seeds = malloc(n_threads * sizeof(uint32_t*));
 		for (uint32_t i = 0; i < n_threads; i++) {
         seeds[i] = malloc(sizeof(uint32_t));
-        *seeds[i] = i + 1;
+        *seeds[i] = i + 1; // xorshift can't start with 0
     }
 
     #pragma omp parallel private(i, p1, sample_index, split_array_length)

C/scratchpad/xorshift.c

@@ -13,7 +13,7 @@ uint32_t xorshift32(uint32_t* state)
 }
 
 float rand_xorshift32(uint32_t* state){
-	return (float) xorshift32(state) / UINT32_MAX;
+	return (float) xorshift32(state) / (float) UINT32_MAX;
 }
 
 int main(){