Like Rodja says, the amount of malto in the actual prodcut most likely will not be high enough to kill your dieting process. Just for reference though, there have been some studies done comparing Maltodextrin, dextrose, and waxy maize as good sources of a pre or post workout carbohydrate and did not show much different in glycogen restoration after a workout. not statistically significant but dextrose was the best of the bunch in this study for getting glycogen levels back up after the exercise protocol.
Other studies have shown Maltodextrin to have 3 times higher glucose response compared to Waxy Maize, and a 3 times higher insulin response.
If your looking for a good carb source I would try Vitargo. Vitargo is a starch carbohydrate with some interesting properties. A study published in 2000 compared Vitargo to maltodextrin plus sugars and their respective effects on glycogen storage after an exhaustive exercise protocol and found Vitargo to be far superior (70% better) to malto/sugars for rapidly replacing muscle glycogen levels both two and four hours after the exercise sessions. Follow up studies throughout the years have shown similar effects as well.