sdm: libs: core: Explicitly ignore result of std::all_of

libc++ makes std::all_of nodiscard, following MSVC.
See https://reviews.llvm.org/D60145.

Bug: 175635923
Test: treehugger
Change-Id: I9c5195bcf8b57dfc53002cb50cec6d1e6fae9e5b
1 file changed