[user/tests/sysparams.c] Added more SetLastError(0)'s

[Paul Vriens]

Hi,

as discussed a few times on wine-devel, there isa  need to clear the
last error before calling a SPI_{GET|SET} routine.

It appears that not every call resets the last error to 0 on succession
and thus errors will propagate and leave us in the dark.

Changelog
  Add more SetLastError(0) statements

Cheers,

Paul.
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