perfs: W-LSB: wlsb_get_minkp_32bits(): avoid computing 32-bit mask
perfs: W-LSB: wlsb_get_minkp_32bits(): avoid computing 32-bit mask

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc