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Revert "kern: RACCT: Keep process credentials alive via references"

Description

Revert "kern: RACCT: Keep process credentials alive via references"

The change causes a panic on boot with INVARIANTS kernels. Revert for
now.

This reverts commit a5d1a0c9bfcca38528b861c5afb51ea9b1696b65.

Reported by: syzbot+74624c6fcbb384ea0113@syzkaller.appspotmail.com