Kernel/SysFS: Remove unused SysFSComponent::entries_count()

Kernel/FileSystem/SysFSComponent.h

@@ -20,7 +20,6 @@ namespace Kernel {
 
 class SysFSComponent : public RefCounted<SysFSComponent> {
 public:
-    virtual KResultOr<size_t> entries_count() const { VERIFY_NOT_REACHED(); };
     virtual StringView name() const { return m_name->view(); }
     virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
     virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
@@ -44,7 +43,6 @@ private:
 
 class SysFSDirectory : public SysFSComponent {
 public:
-    virtual KResultOr<size_t> entries_count() const override { return m_components.size(); };
     virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
     virtual RefPtr<SysFSComponent> lookup(StringView name) override;