klondike - can only calculate the nonce difference on or after the 2nd nonce

driver-klondike.c

@@ -696,8 +696,9 @@ static void klondike_check_nonce(struct cgpu_info *klncgpu, KLIST *kitem)
 			klninfo->delay_count++;
 			klninfo->delay_total += us_diff;
 
+			if (klninfo->nonce_count > 0) {
 				us_diff = us_tdiff(&(kitem->tv_when), &(klninfo->tv_last_nonce_received));
-			if (klninfo->nonce_count == 0) {
+				if (klninfo->nonce_count == 1) {
 					klninfo->nonce_min = us_diff;
 					klninfo->nonce_max = us_diff;
 				} else {
@@ -706,8 +707,9 @@ static void klondike_check_nonce(struct cgpu_info *klncgpu, KLIST *kitem)
 					if (klninfo->nonce_max < us_diff)
 						klninfo->nonce_max = us_diff;
 				}
-			klninfo->nonce_count++;
 				klninfo->nonce_total += us_diff;
+			}
+			klninfo->nonce_count++;
 
 			memcpy(&(klninfo->tv_last_nonce_received), &(kitem->tv_when),
 				sizeof(klninfo->tv_last_nonce_received));