cxgb4: Assign boolean values to a bool variable

Fix the following coccicheck warnings:

./drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:5142:2-33:
WARNING: Assignment of 0/1 to bool variable.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Zhong <abaci-bugfix@linux.alibaba.com>
Link: https://lore.kernel.org/r/1611126111-22079-1-git-send-email-abaci-bugfix@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -5137,7 +5137,7 @@ static int adap_init0(struct adapter *adap, int vpd_skip)
 
 	/* See if FW supports FW_FILTER2 work request */
 	if (is_t4(adap->params.chip)) {
-		adap->params.filter2_wr_support = 0;
+		adap->params.filter2_wr_support = false;
 	} else {
 		params[0] = FW_PARAM_DEV(FILTER2_WR);
 		ret = t4_query_params(adap, adap->mbox, adap->pf, 0,