Don't resume PowerStatsDataStorage read on Exception

If there is a problem with the PowerStatsDataStorage file, the read
should end, instead of catching the excpetion and resuming.

Fixes: 192639542
Test: atest PowerStatsServiceTest (the logcat should not be spammed with
many PowerStats errors)

Change-Id: If2617ab13a8177b75142d52bcad458f80eb5ed2c