xorg/driver/xf86-input-joystick: [PATCH 2/2] Janitor: gcc 4.5 and sparse warnings.

[Paulo César Pereira de Andrade]

  This patch corrects most gcc/sparse warnings.

  The correction for code in format:

if (a >= b)
  rel = a - b;
if (a <= b)
  rel = b - a;
rel = rel / foo;

was changed to the logical equivalent, and clear
to read, but also corrected the warning about rel
possibly being used uninitialized :-)
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