[bug #68586] [troff] refactor `read_identifier()` to populate its argument and return `bool`

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URL:=0A  <https://savannah.gnu.org/bugs/?68586>=0A=0A                 Summa=
ry: [troff] refactor `read_identifier()` to populate its=0Aargument and ret=
urn `bool`=0A                   Group: GNU roff=0A               Submitter:=
 gbranden=0A               Submitted: Sun 02 Aug 2026 12:55:21 AM UTC=0A   =
             Category: Core=0A                Severity: 1 - Wish=0A        =
      Item Group: Refactoring=0A                  Status: None=0A          =
       Privacy: Public=0A             Assigned to: None=0A             Open=
/Closed: Open=0A         Discussion Lock: Unlocked=0A         Planned Relea=
se: None=0A=0A=0A    ______________________________________________________=
_=0A=0AFollow-up Comments:=0A=0A=0A----------------------------------------=
---------------=0ADate: Sun 02 Aug 2026 12:55:21 AM UTC By: G. Branden Robi=
nson <gbranden>=0AMany of the `read_` functions do similarly.  Making the i=
nternal interface=0Aconsistent would ease life for future contributors.=0A=
=0A=0A=0A=0A=0A=0A=0A    __________________________________________________=
_____=0A=0AReply to this item at:=0A=0A  <https://savannah.gnu.org/bugs/?68=
586>=0A=0A_______________________________________________=0AMessage sent vi=
a Savannah=0Ahttps://savannah.gnu.org/=0A
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