[PATCH -next] wifi: ath12k: dp_mon: Fix unsigned comparison with less than zero

[Yang Li]

The return value from the call to idr_alloc() is int.
However, the return value is being assigned to an unsigned
int variable 'buf_id', so making 'buf_id' an int.

Eliminate the following warning:
./drivers/net/wireless/ath/ath12k/dp_mon.c:1300:15-21: WARNING: Unsigned expression compared with zero: buf_id < 0

Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4060
Signed-off-by: Yang Li <yang.lee@xxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath12k/dp_mon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/dp_mon.c b/drivers/net/wireless/ath/ath12k/dp_mon.c
index a214797c96a2..8b3f0769dd58 100644
--- a/drivers/net/wireless/ath/ath12k/dp_mon.c
+++ b/drivers/net/wireless/ath/ath12k/dp_mon.c
@@ -1268,7 +1268,8 @@ int ath12k_dp_mon_buf_replenish(struct ath12k_base *ab,
 	struct sk_buff *skb;
 	struct hal_srng *srng;
 	dma_addr_t paddr;
-	u32 cookie, buf_id;
+	u32 cookie;
+	int buf_id;
 
 	srng = &ab->hal.srng_list[buf_ring->refill_buf_ring.ring_id];
 	spin_lock_bh(&srng->lock);
-- 
2.20.1.7.g153144c