Error with file: Libssh2.swift

[VisualEcho]

I have updated Xcode to 10.2 yesterday.
But when I build my program today, an error at Libssh2.swift: 333

let response = LIBSSH2_USERAUTH_KBDINT_RESPONSE(text: strdup(password), length: UInt32(strlen(password)))

reason is:
Value of optional type 'UnsafePointer?' must be unwrapped to a value of type 'UnsafePointer'

I change the code to:
let response = LIBSSH2_USERAUTH_KBDINT_RESPONSE(text: strdup(password), length: UInt32(strlen(password!)))
and solve this problem, but I don't think that is good way.