Fixed most of the clippy warnings/suggestions.

kernel/src/arch/x86_64/memmap.rs

@@ -35,7 +35,7 @@ static KERNEL_ADDRESS_REQUEST: KernelAddressRequest = KernelAddressRequest::new(
 /// ```
 ///
 /// Returns (virtual_base, physical_base)
-pub static KERNEL_PHYSICAL_MEMORY_OFFSET: Lazy<(u64, u64)> = Lazy::new(|| {
+pub static _KERNEL_PHYSICAL_MEMORY_OFFSET: Lazy<(u64, u64)> = Lazy::new(|| {
     let resp = KERNEL_ADDRESS_REQUEST.get_response().unwrap();
 
     // These are base addresses, using Limine's built in page table.
@@ -49,7 +49,7 @@ pub static KERNEL_PHYSICAL_MEMORY_OFFSET: Lazy<(u64, u64)> = Lazy::new(|| {
 /// Panics if the memory map was not found in MEMORY_MAP_REQUEST.
 pub fn get_memory_map() -> &'static MemoryMapResponse {
     if let Some(memory_map) = MEMORY_MAP_REQUEST.get_response() {
-        return memory_map;
+        memory_map
     } else {
         unreachable!("Could not fetch memory map from Limine.")
     }