cvsserver: remove unused escapeRefName function

Function 'escapeRefName' introduced in 51a7e6d has never been used.

Despite being dead code, changes in Perl 5.41.4 exposed precedence
warning within its logic, which then caused test failures in t9402 by
logging the warnings to stderr while parsing the code. The affected
tests are t9402.30, t9402.31, t9402.32 and t9402.34.

Remove this unused function to simplify the codebase and stop the
warnings and test failures. Its corresponding unescapeRefName function,
which remains in use, has had its comments updated.

Reported-by: Jitka Plesnikova <jplesnik@redhat.com>
Signed-off-by: Ondřej Pohořelský <opohorel@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: opohorel

git-cvsserver.perl

@@ -4986,13 +4986,13 @@ sub gethistorydense
     return $result;
 }
 
-=head2 escapeRefName
+=head2 unescapeRefName
 
-Apply an escape mechanism to compensate for characters that
+Undo an escape mechanism to compensate for characters that
 git ref names can have that CVS tags can not.
 
 =cut
-sub escapeRefName
+sub unescapeRefName
 {
     my($self,$refName)=@_;
 
@@ -5009,27 +5009,6 @@ sub escapeRefName
     #   = "_-xx-" Where "xx" is the hexadecimal representation of the
     #     desired ASCII character byte. (for anything else)
 
-    if(! $refName=~/^[1-9][0-9]*(\.[1-9][0-9]*)*$/)
-    {
-        $refName=~s/_-/_-u--/g;
-        $refName=~s/\./_-p-/g;
-        $refName=~s%/%_-s-%g;
-        $refName=~s/[^-_a-zA-Z0-9]/sprintf("_-%02x-",$1)/eg;
-    }
-}
-
-=head2 unescapeRefName
-
-Undo an escape mechanism to compensate for characters that
-git ref names can have that CVS tags can not.
-
-=cut
-sub unescapeRefName
-{
-    my($self,$refName)=@_;
-
-    # see escapeRefName() for description of escape mechanism.
-
     $refName=~s/_-([spu]|[0-9a-f][0-9a-f])-/unescapeRefNameChar($1)/eg;
 
     # allowed tag names