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Fix a potential double-free in ecpg.
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@ -565,6 +565,7 @@ cppline {space}*#([^i][A-Za-z]*|{if}|{ifdef}|{ifndef}|{import})((\/\*[^*/]*\*+
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{
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addlit(yytext, yyleng);
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free(dolqstart);
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dolqstart = NULL;
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BEGIN(SQL);
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base_yylval.str = mm_strdup(literalbuf);
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return DOLCONST;
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