chore: remove unused stdio.h include from main.c and fix typo in comment

src/connection.c

@@ -973,7 +973,6 @@ static void handle_forwarding(connection_t *conn) {
     if (bytes_read == 0) {
         log_debug("EOF on fd %d, performing half-close on pair fd %d", conn->fd, pair->fd);
         conn->half_closed = 1;
-        connection_modify_epoll(conn->fd, buffer_available_read(&conn->write_buf) ? EPOLLOUT : 0);
 
         if (pair->fd != -1 && !pair->write_shutdown) {
             if (shutdown(pair->fd, SHUT_WR) == -1 && errno != ENOTCONN) {
@@ -984,6 +983,10 @@ static void handle_forwarding(connection_t *conn) {
 
         if (pair->half_closed) {
             connection_close(conn->fd);
+        } else if (buffer_available_read(&conn->write_buf) > 0) {
+            connection_modify_epoll(conn->fd, EPOLLOUT);
+        } else {
+            connection_modify_epoll(conn->fd, EPOLLIN);
         }
         return;
     }