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when strlen pi->location_code is larger than HVCS_CLC_LENGTH + 1,
original implementation can not let hvcsd->p_location_code NUL terminated.
so need fix it (also can simplify the code)
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>