Smatch says that skb->data is untrusted so we need to check to make sure
that the memcpy() doesn't overflow.

Fixes: cfad1ba8 ('NFC: Initial support for Inside Secure microread')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>