Murray Carter, in his DVD on Sharpening, makes checking for straightness one of the steps in sharpening.
That being said, he will try to straighten it by applying pressure to the blade as it lays against a flat surface. He cautions that you do this at the risk of damaging or breaking the blade.
Personally, if the blade still closes easily and is not scraping the liners, I think that I would leave well enough alone.