Kernel: Remove unused function ProcFS::add_sys_string

Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/869becc944f
Pull-request: https://github.com/SerenityOS/serenity/pull/6845

Kernel/FileSystem/ProcFS.cpp

@@ -961,19 +961,6 @@ void ProcFS::add_sys_bool(String&& name, Lockable<bool>& var, Function<void()>&&
     sys_variables().append(move(variable));
 }
 
-void ProcFS::add_sys_string(String&& name, Lockable<String>& var, Function<void()>&& notify_callback)
-{
-    InterruptDisabler disabler;
-
-    SysVariable variable;
-    variable.name = move(name);
-    variable.type = SysVariable::Type::String;
-    variable.notify_callback = move(notify_callback);
-    variable.address = &var;
-
-    sys_variables().append(move(variable));
-}
-
 bool ProcFS::initialize()
 {
     static Lockable<bool>* kmalloc_stack_helper;

Kernel/FileSystem/ProcFS.h

@@ -32,7 +32,6 @@ public:
     virtual NonnullRefPtr<Inode> root_inode() const override;
 
     static void add_sys_bool(String&&, Lockable<bool>&, Function<void()>&& notify_callback = nullptr);
-    static void add_sys_string(String&&, Lockable<String>&, Function<void()>&& notify_callback = nullptr);
 
 private:
     ProcFS();