SFTP connection invalid port causes NPE

[avuton]

Host/user/pass don't matter, entering an invalid TCP port (above 65535) causes an NPE like the one below. This is from commit cdba479.

02-07 10:22:45.119  4176  4176 E AndroidRuntime: FATAL EXCEPTION: main
02-07 10:22:45.119  4176  4176 E AndroidRuntime: Process: com.amaze.filemanager, PID: 4176
02-07 10:22:45.119  4176  4176 E AndroidRuntime: java.lang.NullPointerException: Attempt to read from field 'java.lang.Throwable com.amaze.filemanager.filesystem.ssh.tasks.AsyncTaskResult.exception' on a null object reference
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at com.amaze.filemanager.filesystem.ssh.tasks.GetSshHostFingerprintTask.onPostExecute(GetSshHostFingerprintTask.java:119)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at com.amaze.filemanager.filesystem.ssh.tasks.GetSshHostFingerprintTask.onPostExecute(GetSshHostFingerprintTask.java:64)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.os.AsyncTask.finish(AsyncTask.java:695)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.os.AsyncTask.-wrap1(Unknown Source:0)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:106)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:164)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:6494)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
02-07 10:22:45.119  4176  4176 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
02-07 10:22:45.124  1320 19465 W ActivityManager:   Force finishing activity com.amaze.filemanager/.activities.MainActivity