This can be an assert()

Change-Id: I2b0a8f50359e5b12fa27bf48c355f736e2b05033
Reviewed-on: https://gerrit.libreoffice.org/26491
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Takeshi Abe <tabe@fixedpoint.jp>
diff --git a/starmath/source/parse.cxx b/starmath/source/parse.cxx
index 5092532..7d02bad 100644
--- a/starmath/source/parse.cxx
+++ b/starmath/source/parse.cxx
@@ -1987,39 +1987,36 @@ void SmParser::DoBrace()
    }
    else
    {
        if (TokenInGroup(TG::LBrace))
        {
            pLeft = new SmMathSymbolNode(m_aCurToken);
        assert(TokenInGroup(TG::LBrace));

            NextToken();
            DoBracebody(false);
            pBody = popOrZero(m_aNodeStack);
        pLeft = new SmMathSymbolNode(m_aCurToken);

            SmTokenType  eExpectedType = TUNKNOWN;
            switch (pLeft->GetToken().eType)
            {   case TLPARENT :     eExpectedType = TRPARENT;   break;
                case TLBRACKET :    eExpectedType = TRBRACKET;  break;
                case TLBRACE :      eExpectedType = TRBRACE;    break;
                case TLDBRACKET :   eExpectedType = TRDBRACKET; break;
                case TLLINE :       eExpectedType = TRLINE;     break;
                case TLDLINE :      eExpectedType = TRDLINE;    break;
                case TLANGLE :      eExpectedType = TRANGLE;    break;
                case TLFLOOR :      eExpectedType = TRFLOOR;    break;
                case TLCEIL :       eExpectedType = TRCEIL;     break;
                default :
                    SAL_WARN("starmath", "unknown case");
        NextToken();
        DoBracebody(false);
        pBody = popOrZero(m_aNodeStack);

        SmTokenType  eExpectedType = TUNKNOWN;
        switch (pLeft->GetToken().eType)
        {   case TLPARENT :     eExpectedType = TRPARENT;   break;
            case TLBRACKET :    eExpectedType = TRBRACKET;  break;
            case TLBRACE :      eExpectedType = TRBRACE;    break;
            case TLDBRACKET :   eExpectedType = TRDBRACKET; break;
            case TLLINE :       eExpectedType = TRLINE;     break;
            case TLDLINE :      eExpectedType = TRDLINE;    break;
            case TLANGLE :      eExpectedType = TRANGLE;    break;
            case TLFLOOR :      eExpectedType = TRFLOOR;    break;
            case TLCEIL :       eExpectedType = TRCEIL;     break;
            default :
                SAL_WARN("starmath", "unknown case");
            }

            if (m_aCurToken.eType == eExpectedType)
            {
        if (m_aCurToken.eType == eExpectedType)
        {
                pRight = new SmMathSymbolNode(m_aCurToken);
                NextToken();
            }
            else
                eError = PE_PARENT_MISMATCH;
        }
        else
            eError = PE_LBRACE_EXPECTED;
            eError = PE_PARENT_MISMATCH;
    }

    if (eError == PE_NONE)