wifi: mt76: Remove unused inline function mt76_wcid_mask_test()

All uses of mt76_wcid_mask_test() have
been removed since commit 8950a62f ("mt76: get rid of
mt76_wcid_hw routine"), so remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/util.h

@@ -29,12 +29,6 @@ enum {
 
 int mt76_wcid_alloc(u32 *mask, int size);
 
-static inline bool
-mt76_wcid_mask_test(u32 *mask, int idx)
-{
-	return mask[idx / 32] & BIT(idx % 32);
-}
-
 static inline void
 mt76_wcid_mask_set(u32 *mask, int idx)
 {