Kernel: Use default constructors/destructors

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Kernel/FileSystem/InodeFile.cpp

@@ -22,9 +22,7 @@ InodeFile::InodeFile(NonnullRefPtr<Inode>&& inode)
 {
 }
 
-InodeFile::~InodeFile()
-{
-}
+InodeFile::~InodeFile() = default;
 
 ErrorOr<size_t> InodeFile::read(OpenFileDescription& description, u64 offset, UserOrKernelBuffer& buffer, size_t count)
 {