fix: timeout

src/main.c

@@ -152,6 +152,9 @@ int main(int ac, char **av)
         {
             ssize_t recv_size = recvfrom(sockfd, buffer, recv_packet_size, 0, (struct sockaddr *) &sender, &len);
             
+            if (recv_size == -1)
+                break;
+
             gettimeofday(&stop, NULL);
 
             struct icmphdr *recv_hdr = (struct icmphdr *) (buffer + sizeof(struct iphdr));