[Bug libfortran/77868] New: Fail to NULL guard check for internal unit in inquire_via_unit

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77868

            Bug ID: 77868
           Summary: Fail to NULL guard check for internal unit in
                    inquire_via_unit
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jvdelisle at gcc dot gnu.org
  Target Milestone: ---

Subject is self explanatory. The commit that added the check broke a few test
cases.