Content PosX, PosY, PosZ are set to NaN, when there is content size fitter with Horizontal Fit set to Min Size attached to it, scroll view is Clamped and in Screen Space canvas.

Reproduction steps:
1. Open attached project
2. Select Content GameObject
3. Open the inspector
4. Enter Play mode
5. Observe Content position

Expected: it doesn't change
Actual: it gets incremented and eventually reaches NaN

Not reproduced on: 5.6.0b1
Reproduced on: 5.6.0b2, 5.6.0f3, 2017.1.0a6
Regression introduced on: 5.6.0b2