net: sched: fix coding style issues

This patch fix checkpatch issues for upcomming patches according to the
sched api file. It changes mostly how to check on null pointer.

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Alexander Aring

net/sched/sch_api.c

@@ -669,7 +669,7 @@ int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
 	unsigned int size = 4;
 
 	clhash->hash = qdisc_class_hash_alloc(size);
-	if (clhash->hash == NULL)
+	if (!clhash->hash)
 		return -ENOMEM;
 	clhash->hashsize  = size;
 	clhash->hashmask  = size - 1;

net/sched/sch_cbq.c

@@ -1150,12 +1150,13 @@ static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
 	if (err < 0)
 		return err;
 
-	if (tb[TCA_CBQ_RTAB] == NULL || tb[TCA_CBQ_RATE] == NULL)
+	if (!tb[TCA_CBQ_RTAB] || !tb[TCA_CBQ_RATE])
 		return -EINVAL;
 
 	r = nla_data(tb[TCA_CBQ_RATE]);
 
-	if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL)
+	q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB]);
+	if (!q->link.R_tab)
 		return -EINVAL;
 
 	err = tcf_block_get(&q->link.block, &q->link.filter_list, sch);
@@ -1460,7 +1461,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
 	struct cbq_class *parent;
 	struct qdisc_rate_table *rtab = NULL;
 
-	if (opt == NULL)
+	if (!opt)
 		return -EINVAL;
 
 	err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, NULL);
@@ -1532,8 +1533,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
 	if (parentid == TC_H_ROOT)
 		return -EINVAL;
 
-	if (tb[TCA_CBQ_WRROPT] == NULL || tb[TCA_CBQ_RATE] == NULL ||
-	    tb[TCA_CBQ_LSSOPT] == NULL)
+	if (!tb[TCA_CBQ_WRROPT] || !tb[TCA_CBQ_RATE] || !tb[TCA_CBQ_LSSOPT])
 		return -EINVAL;
 
 	rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB]);
@@ -1565,7 +1565,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
 	if (parentid) {
 		parent = cbq_class_lookup(q, parentid);
 		err = -EINVAL;
-		if (parent == NULL)
+		if (!parent)
 			goto failure;
 	}
 

net/sched/sch_gred.c

@@ -306,12 +306,13 @@ static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps)
 	struct tc_gred_sopt *sopt;
 	int i;
 
-	if (dps == NULL)
+	if (!dps)
 		return -EINVAL;
 
 	sopt = nla_data(dps);
 
-	if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs)
+	if (sopt->DPs > MAX_DPs || sopt->DPs == 0 ||
+	    sopt->def_DP >= sopt->DPs)
 		return -EINVAL;
 
 	sch_tree_lock(sch);
@@ -470,7 +471,7 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt)
 	struct nlattr *tb[TCA_GRED_MAX + 1];
 	int err;
 
-	if (opt == NULL)
+	if (!opt)
 		return -EINVAL;
 
 	err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, NULL);

net/sched/sch_hfsc.c

@@ -1396,7 +1396,7 @@ hfsc_init_qdisc(struct Qdisc *sch, struct nlattr *opt)
 
 	qdisc_watchdog_init(&q->watchdog, sch);
 
-	if (opt == NULL || nla_len(opt) < sizeof(*qopt))
+	if (!opt || nla_len(opt) < sizeof(*qopt))
 		return -EINVAL;
 	qopt = nla_data(opt);
 

net/sched/sch_multiq.c

@@ -243,7 +243,7 @@ static int multiq_init(struct Qdisc *sch, struct nlattr *opt)
 
 	q->queues = NULL;
 
-	if (opt == NULL)
+	if (!opt)
 		return -EINVAL;
 
 	err = tcf_block_get(&q->block, &q->filter_list, sch);

net/sched/sch_tbf.c

@@ -428,7 +428,7 @@ static int tbf_init(struct Qdisc *sch, struct nlattr *opt)
 	qdisc_watchdog_init(&q->watchdog, sch);
 	q->qdisc = &noop_qdisc;
 
-	if (opt == NULL)
+	if (!opt)
 		return -EINVAL;
 
 	q->t_c = ktime_get_ns();