[bug #46261] missing usage of EINTRLOOP macro

[Jack Howarth]

Follow-up Comment #6, bug #46261 (project make):

How do we know that the earlier call to duplicate the file descriptor in the
new_job() subroutine of job.c succeeds?

        /* Make sure we have a dup'd FD.  */
        if (job_rfd < 0)
          {
            DB (DB_JOBS, ("Duplicate the job FDn"));
            job_rfd = dup (job_fds[0]);
          }

There does't be a check if -1 was returned to job_rd or any error code placed
on the global errno.

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