loplugin:stringconstant

Change-Id: I84657379bfc999df40a17fc199bdd20b95414e32
Reviewed-on: https://gerrit.libreoffice.org/68468
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

idlc/source/scanner.l

@@ -240,7 +240,7 @@ static void parseLineAndFile(sal_Char* pBuf)
     for (; *r != '"'; r++) ;
     *r = 0;
     if (*h == '\0')
-        idlc()->setFileName(OString("standard input"));
+        idlc()->setFileName("standard input");
     else
         idlc()->setFileName(OString(h));