For clock_getres(clockid_t clock_id, struct timespec *res), the specification
says "If res is NULL, the clock resolution is not returned." So this kind of
call should succeed.  The current implementation returns -EFAULT.

The patch fixes the bug in compat_clock_getres().
Signed-off-by: Gordon Jin <gordon.jin@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>