wpan-phy: use snprintf to limit the amount of chars written
Use snprintf to limit the amount of chars put in the buffer for attr -> show.
Signed-off-by: 
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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Use snprintf to limit the amount of chars put in the buffer for attr -> show.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>