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Commit efcb4ff2 authored by Shen Lin's avatar Shen Lin
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Fix NPE when store brightness and displayDevice is null 

This issue can cause a phone reboot, we have to make sure displayDevice is not null before getting its unique id.

Bug: 249782095
Test: manual
Change-Id: Iec57f44798820ac741bd2e6843874fb2b1aaef12
parent 6216ab81
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