Kernel: Remove unused AHCIPort::ScatterList::m_device_block_size.

Kernel/Storage/AHCIPort.cpp

@@ -43,7 +43,6 @@ NonnullRefPtr<AHCIPort::ScatterList> AHCIPort::ScatterList::create(AsyncBlockDev
 
 AHCIPort::ScatterList::ScatterList(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
     : m_vm_object(AnonymousVMObject::create_with_physical_pages(allocated_pages))
-    , m_device_block_size(device_block_size)
 {
     m_dma_region = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)), "AHCI Scattered DMA", Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
 }

Kernel/Storage/AHCIPort.h

@@ -63,7 +63,6 @@ private:
     private:
         ScatterList(AsyncBlockDeviceRequest&, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size);
         NonnullRefPtr<AnonymousVMObject> m_vm_object;
-        size_t m_device_block_size;
         OwnPtr<Region> m_dma_region;
     };