Fix a memory leak in UidState.

Test: atest ProcessStatsTest
Bug: 271320793
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1635233cd4eabd0225769f37e737b770388bf340)
Merged-In: I22e0e266a346f24c7ca0a95bf450320c8b68cbb1
Change-Id: I22e0e266a346f24c7ca0a95bf450320c8b68cbb1
2 files changed