You're probably fine. While curing too long can sometimes result in somewhat harder textured meat or meat that's too salty you should be okay. Mitigate this a bit by rinsing your meat very well then soaking it for a several hours in cold water, changing the water a couple times. If you wish, trim a little piece off at this point and fry it up to taste salt levels; soak longer if you wish. Drain and dry the meat well and continue with your drying and smoking procedure.