nfc: llcp: use test_bit()

Use test_bit() instead of open-coding it, just like in other places
touching the bitmap.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/nfc/llcp_core.c

@@ -383,7 +383,7 @@ u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
 			pr_debug("WKS %d\n", ssap);
 
 			/* This is a WKS, let's check if it's free */
-			if (local->local_wks & BIT(ssap)) {
+			if (test_bit(ssap, &local->local_wks)) {
 				mutex_unlock(&local->sdp_lock);
 
 				return LLCP_SAP_MAX;