CIFS: Simplify SMB2_open code path

by passing a filename to a separate iovec regardless of its length.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steven French <steven@steven-GA-970A-DS3.(none)>
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index f31043b..8b1025f 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -428,7 +428,7 @@
 	__le16 NameLength;
 	__le32 CreateContextsOffset;
 	__le32 CreateContextsLength;
-	__u8   Buffer[8];
+	__u8   Buffer[0];
 } __packed;
 
 struct smb2_create_rsp {