net: rps: fix uninitialized symbol warning

This patch fixes uninitialized symbol warning that
got introduced by the following commit
773fc8f6 ("net: rps: send out pending IPI's on CPU hotplug")
Signed-off-by: Ashwanth Goli <ashwanth@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -8203,7 +8203,7 @@ static int dev_cpu_dead(unsigned int oldcpu)
 	struct sk_buff **list_skb;
 	struct sk_buff *skb;
 	unsigned int cpu;
-	struct softnet_data *sd, *oldsd, *remsd;
+	struct softnet_data *sd, *oldsd, *remsd = NULL;
 
 	local_irq_disable();
 	cpu = smp_processor_id();