Replace NULL/0 with nullptr

Fixes -Wzero-as-null-pointer-constant warning.

clang-tidy -checks=modernize-use-nullptr -p compile_commands.json -fix ...

Test: m
Bug: 68236239
Change-Id: I3a8e982ba40f9b029bafef78437b146a878f56a9
Merged-In: I3a8e982ba40f9b029bafef78437b146a878f56a9
(cherry picked from commit 48a619f8)