A common fear when talking about drive out of corners is the fear of the back end stepping out or sliding, but let me offer you this comfort blanket.
If the back steps out when you start to apply your exit power, I would very much like to assume that because you are at the exit you are starting to pick the bike up as a natural part of the corner exit routine.
Yes the rear may have stepped out, but as you pick the bike up you are picking it up into the slide and aligning the front and rear wheels once more, meaning eventually the rear tyre will regain full grip because the bike is now upright.