Fix iOS audio driver attempting to start output too early #98305
+1
−1
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Fixes #87560.
The code for audio output resuming when returning from the background in
OS_IOS::on_focus_in
caused iOS builds to throw an error on startup, since the same function is also called on the initial launch, when not all the necessary components exist yet. This adds a null pointer check to prevent the invalid attempt. The audio output will still start once the AudioServer is initialized.