Mem: Fix alloc subtraction issue · corigan01/QuantumOS@e688a77

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Run cargo run -- build: crates/fs/src/fatfs/mod.rs#L68

associated constants `ALLOCATED_CLUSTER_BEGIN`, `FAT16_MAX`, and `FAT32_MAX` are never used

Run cargo run -- build: crates/fs/src/fatfs/bpb.rs#L94

associated constants `FAT12_CLUSTERS` and `FAT16_CLUSTERS` are never used

Run cargo run -- build: crates/mem/src/alloc.rs#L32

unused import: `logln`

Run cargo run -- build: crates/mem/src/vmm/page.rs#L361

unused variable: `vpage`

Run cargo run -- build: crates/mem/src/vmm/page.rs#L361

unused variable: `ppage`

Run cargo run -- build: crates/mem/src/vmm.rs#L150

field `backing` is never read

Run cargo run -- build: crates/mem/src/vmm.rs#L170

methods `hydrate_page`, `fault_handler`, and `vm_pages` are never used

Run cargo run -- build: crates/mem/src/vmm.rs#L229

field `page_table` is never read

Run cargo run -- build: crates/mem/src/vmm.rs#L244

field `active_process` is never read

Run cargo run -- build: crates/mem/src/vmm/page.rs#L361

method `map_page` is never used

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