Clippy fixes

clippy.sh

src/acpi/madt.rs

src/arch/aarch64/device/cpu/mod.rs

src/arch/x86/idt.rs

src/arch/x86_64/idt.rs

src/arch/x86_64/paging/mod.rs

src/arch/x86_64/start.rs

src/context/arch/x86_64.rs

src/context/context.rs

src/context/memory.rs

src/devices/graphical_debug/debug.rs

src/devices/graphical_debug/mod.rs

src/event.rs

src/log.rs

src/memory/mod.rs

src/ptrace.rs

src/scheme/irq.rs

src/scheme/pipe.rs

src/scheme/proc.rs

src/scheme/root.rs