[Bug libfortran/83613] New: [8 Regression] Executing gfortran.dg/inquire_internal.f90 hangs on darwin after r255621

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83613

            Bug ID: 83613
           Summary: [8 Regression] Executing
                    gfortran.dg/inquire_internal.f90 hangs on darwin after
                    r255621
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: jvdelisle at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-apple-darwin*
            Target: x86_64-apple-darwin*
             Build: x86_64-apple-darwin*

Executing gfortran.dg/inquire_internal.f90 hangs on darwin after r255621 (in a
way similar to that reported in pr30617). This is fixed if I revert the second
hunk in libgfortran/io/unit.c.