tdf#100726 Improve readability of OUString concatination

fixed the bug on rsc/source/rsc/rsc.cxx

Change-Id: I0c1c92f63b8c18d3acbdcf74e7284a2dae19da44
Reviewed-on: https://gerrit.libreoffice.org/29451Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

rsc/source/rsc/rsc.cxx

@@ -617,8 +617,8 @@ ERRTYPE RscCompiler::Link()
             }
             catch (RscIoError&)
             {
-                OString sMsg("Error with paths:\n");
-                sMsg += "temporary rc file: " + aRcTmp + "\n"
+                OString sMsg = "Error with paths:\n"
+                        "temporary rc file: " + aRcTmp + "\n"
                         "temporary ilst file: " + aSysListTmp + "\n"
                         "ilst file: " + aSysList + "\n";
                 pTC->pEH->FatalError(ERR_OPENFILE, RscId(), sMsg.getStr());