redirect to call assignPointerIds if there is id < 0 case

Symptom: If assignPointerIds() is not called, the unknown value of
outPointer.id will lead to undefined things
Root Cause: mHavePointerIds be overwritten to true in last cycle
Solution: recover mHavePointerIds=false if any id < 0, to call assignPointerIds()

https://code.google.com/p/android/issues/detail?id=221273



Change-Id: I65ca0b82a6fceb495a0de17315b1f49cdab5fba0
Signed-off-by: gaoshang <gaoshang@xiaomi.com>