Added error checking for socket closing.

client.c

@@ -76,7 +76,11 @@ static void parse(int argc, char *argv[])
 
 static void cleanup(void)
 {
-        close(sockfd);
+        if (close(sockfd) < 1) {
+		perror(pname);
+		return 1;	
+	}
+	
         free(ai);
 }