attempt to prevent future endless loops in io_wait half-closed fd

cleanup

io/io_canread.c

@@ -51,9 +51,7 @@ int64 io_canread() {
     if (e->closed) {
       /* The fd was previously closed, but there were still open events on it.
        * To prevent race conditions, we did not actually close the fd
-       * but only marked it as closed, so we can skip this event here
+       * but only marked it as closed, so we can skip this event here */
-       * and really closed it now. */
-      io_close(r);
       continue;
     }
 

io/io_canwrite.c

@@ -46,9 +46,7 @@ int64 io_canwrite() {
     if (e->closed) {
       /* The fd was previously closed, but there were still open events on it.
        * To prevent race conditions, we did not actually close the fd
-       * but only marked it as closed, so we can skip this event here
+       * but only marked it as closed, so we can skip this event here */
-       * and really closed it now. */
-      io_close(r);
       continue;
     }