[ffmemless] Add check for device existence to plugin loading
[ffmemless] Add check for device existence to plugin loading

Ngfd fails to run in SDK as there is no ffmemless device, and
a sink failing init will stop whole ngfd from working. Added
a check to plugin load for the device existance, so we don't
even load the plugin if we can't run it.

Signed-off-by: Kalle Jokiniemi <00a0ccb0d5d1dac2286489d88c3bc125957675d2@jollamobile.com>

jusa/ngfd,android-808/ngfd,android-808/ngfd,jusa/ngfd,jusa/ngfd