(handle_nonblock_error): Ignore errno ENOTTY. For some

unknown reason, this happens on FreeBSD 5.

Rev: src/io.c:1.211

src/io.c

@@ -1338,10 +1338,14 @@ handle_nonblock_error(const char *msg)
   /* On BSD, trying to set /dev/null in nonblocking mode fails with
    * errno 19, ENODEV. We have to ignore that.
    *
-   * For now, still display a warning message, to keep track if when
+   * FreeBSD 5 seem to have a similar problem, sometimes returning
+   * ENOTTY. Not sure for what kind of fd:s that happen, though. The
+   * choice of errno code seems pretty odd to me.
+   *
+   * For now, still display a warning message, to keep track of when
    * and where it occurs.
    */
-  if (errno == ENODEV)
+  if (errno == ENODEV || errno == ENOTTY)
     werror("%z %e\n", msg, errno);
   else
     fatal("%z %e\n", msg, errno);