fix: lp.c wrong return code

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hi,
how takes care about the lp driver ? i saw some changes in the 2.4 but found no maintainer.
to the maintainer:
LPGETSTATS is strange. first you set LP_STAT then you delete it. maybe a EACCES (Permission denied) would do it ?

problem:
calling the ioctl( LPSETIRQ ) the driver returns EINVAL (Invalid argument)instead of ENOSYS.

Fix : return ENOSYS (Function not implemented)

NOTE:
if EINVAL is correct, you can delete the entiere entry, EINVAL in default.

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