Initializing OpenSSHKeyV1KeyFile does not use correct publicKey for null check

[katjas]

Hi there,
there is an issue in the init method of OpenSSHKeyV1KeyFile - it'0s checking the "pubKey" on null, instead of the "publicKey" which is passed to the method. Like this, the pubKey stays null always.
Thanks for checking,
Katja

sshj/src/main/java/com/hierynomus/sshj/userauth/keyprovider/OpenSSHKeyV1KeyFile.java

Line 124 in 31ed354

if (pubKey != null) {

[dkocher]

In #944.

[dkocher]

Duplicate for #907.