degesch: fix a Lua error message
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@ -8401,7 +8401,7 @@ lua_plugin_check_utf8 (lua_State *L, int arg)
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{
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size_t len;
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const char *s = luaL_checklstring (L, arg, &len);
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luaL_argcheck (L, utf8_validate (s, len), 1, "must be valid UTF-8");
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luaL_argcheck (L, utf8_validate (s, len), arg, "must be valid UTF-8");
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return s;
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}
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