pkt_sched: Fix warning false positives.

GCC refuses to recognize that all error control flows do in fact
set err to something.

Add an explicit initialization to shut it up.

net/sched/sch_drr.c: In function ‘drr_enqueue’:
net/sched/sch_drr.c:359:11: warning: ‘err’ may be used uninitialized in this function [-Wmaybe-uninitialized]
net/sched/sch_qfq.c: In function ‘qfq_enqueue’:
net/sched/sch_qfq.c:885:11: warning: ‘err’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_drr.c

diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 9ce0b4f..71e50c8 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -352,7 +352,7 @@
 {
 	struct drr_sched *q = qdisc_priv(sch);
 	struct drr_class *cl;
-	int err;
+	int err = 0;
 
 	cl = drr_classify(skb, sch, &err);
 	if (cl == NULL) {