[PKTGEN]: pktgen should not print info that it is spinning

when using pktgen to send delay packets the module prints repeatedly
to the kernel log:

sleeping for X
sleeping for X
...

This is probably just a debugging item left in and should not be
enabled for regular use of the module.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/pktgen.c

@@ -2042,7 +2042,6 @@ static void spin(struct pktgen_dev *pkt_dev, __u64 spin_until_us)
 	__u64 now;
 
 	start = now = getCurUs();
-	printk(KERN_INFO "sleeping for %d\n", (int)(spin_until_us - now));
 	while (now < spin_until_us) {
 		/* TODO: optimize sleeping behavior */
 		if (spin_until_us - now > jiffies_to_usecs(1) + 1)