Staging: rtl8192su: fix up printk warnings

This patch addresses printk warnings.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/rtl8192su/ieee80211/ieee80211_wx.c b/drivers/staging/rtl8192su/ieee80211/ieee80211_wx.c
index 145a312..1077590 100644
--- a/drivers/staging/rtl8192su/ieee80211/ieee80211_wx.c
+++ b/drivers/staging/rtl8192su/ieee80211/ieee80211_wx.c
@@ -772,7 +772,7 @@
 	{
 		if (len != ie[1]+2)
 		{
-			printk("len:%d, ie:%d\n", len, ie[1]);
+			printk("len: %Zd, ie:%d\n", len, ie[1]);
 			return -EINVAL;
 		}
 		buf = kmalloc(len, GFP_KERNEL);