[SCSI] libfcoe: Fix incorrect MAC address clearing

Fix typo in memset. Incorrect length parameter to memset resulting non-zero MAC address in FPMA messages.

Signed-off-by: Kaladhar Musunuru <kmusunuru@juniper.net>
Acked-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
index 948364a..080e4ec 100644
--- a/drivers/scsi/fcoe/libfcoe.c
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -439,7 +439,7 @@
 	cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 
 	mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
-	memset(mac, 0, sizeof(mac));
+	memset(mac, 0, sizeof(*mac));
 	mac->fd_desc.fip_dtype = FIP_DT_MAC;
 	mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 	if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {