RTEMS | Fix panic issue which caused by pipe. (!267)

[yang zhang (@yang.zhang)]

yang zhang commented on a discussion on cpukit/libcsupport/src/fcntl.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/267#note_113841

 >      rv = (*diop->pathinfo.handlers->open_h)( diop, NULL, oflag, 0 );
 >      if ( rv == 0 ) {
 >        rtems_libio_iop_flags_set(
 > -        diop,
 > -        LIBIO_FLAGS_OPEN | rtems_libio_fcntl_flags( oflag )
 > -      );
 > +        diop, LIBIO_FLAGS_OPEN);

I check the implement of `rtems_libio_iop_flags_set`, found that it's  _Atomic_Fetch_or_uint, it would fetch the existing flags then or OPEN.
So, i think that maybe only set open flag is enough.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/267#note_113841
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