dinput: Clamp joystick position values to min-max range

[Vitaliy Margolen]

Because of rounding errors it was possible to have -+ 1 outside the
required range.

Fixes bugs 12643 and 10969.
---
 dlls/dinput/joystick_linuxinput.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
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