You should be fine
1. When you apply too much protector, in volume or concentration, the fiber will only accept what it's able to accept. Most of the excess will likely be removable with a stiff brush followed by vacuuming.
2. If there is either a milky haze and/or a crunchy feel remaining, apply a preconditioner with a good boost of solvent additive. Brush it in, allow it to sit for 15-20 minutes, then flush with hot water and an acidic rinse agent.
3. Steps 1 and 2 should take care of it. If you have to use step two, you will have to reapply the upholstery protector. Make sure that the fabric is as residue free as possible first.