Kernel: Use = default for empty destructors

Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/c0341215de4
Pull-request: https://github.com/SerenityOS/serenity/pull/9720

Kernel/Bus/VirtIO/Device.cpp

@@ -116,10 +116,6 @@ UNMAP_AFTER_INIT VirtIO::Device::Device(PCI::Address address)
     set_status_bit(DEVICE_STATUS_DRIVER);
 }
 
-Device::~Device()
-{
-}
-
 auto Device::mapping_for_bar(u8 bar) -> MappedMMIO&
 {
     VERIFY(m_use_mmio);

Kernel/Bus/VirtIO/Device.h

@@ -88,7 +88,7 @@ class Device
     : public PCI::Device
     , public IRQHandler {
 public:
-    virtual ~Device() override;
+    virtual ~Device() override = default;
 
 protected:
     virtual StringView class_name() const = 0;

Kernel/Bus/VirtIO/RNG.cpp

@@ -33,10 +33,6 @@ UNMAP_AFTER_INIT RNG::RNG(PCI::Address address)
     }
 }
 
-RNG::~RNG()
-{
-}
-
 bool RNG::handle_device_config_change()
 {
     VERIFY_NOT_REACHED(); // Device has no config

Kernel/Bus/VirtIO/RNG.h

@@ -21,7 +21,7 @@ class RNG final
 public:
     static NonnullRefPtr<RNG> must_create(PCI::Address address);
     virtual StringView purpose() const override { return class_name(); }
-    virtual ~RNG() override;
+    virtual ~RNG() override = default;
 
 private:
     virtual StringView class_name() const override { return "VirtIOConsole"; }