Hi Andrew,
If it is a small bend you may not realy notice any differance as when the mast rotates it will always bend to windward when sheeted.
If you are concerned, one option you could try is to put it between two trees (use planks of wood between mast and tree to protect and distribute load ie 4 planks about 3 foot long.) and walk with it in the opposite direction to bend. Be very carefull, slowly increase the distance each time and take your time..... also try and feel it.
I have broken one mast in the past using this method but it was quiet a large bend and I had nothing to loose. Now I can make a gaff rigged Tornado.