ibmvnic: Fix size of debugfs name buffer

This mistake was causing debugfs directory creation
failures when multiple ibmvnic devices were probed.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 921c40f..4f3281a 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3705,7 +3705,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
 	struct net_device *netdev;
 	unsigned char *mac_addr_p;
 	struct dentry *ent;
-	char buf[16]; /* debugfs name buf */
+	char buf[17]; /* debugfs name buf */
 	int rc;
 
 	dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",