Kernel: Add initializer for Thread::m_tss

Kernel/Thread.cpp

@@ -77,7 +77,6 @@ Thread::Thread(NonnullRefPtr<Process> process)
     set_default_signal_dispositions();
     m_fpu_state = (FPUState*)kmalloc_aligned<16>(sizeof(FPUState));
     reset_fpu_state();
-    memset(&m_tss, 0, sizeof(m_tss));
     m_tss.iomapbase = sizeof(TSS32);
 
     // Only IF is set when a process boots.

Kernel/Thread.h

@@ -1238,7 +1238,7 @@ private:
     mutable RecursiveSpinLock m_block_lock;
     NonnullRefPtr<Process> m_process;
     ThreadID m_tid { -1 };
-    TSS32 m_tss;
+    TSS32 m_tss {};
     TrapFrame* m_current_trap { nullptr };
     u32 m_saved_critical { 1 };
     IntrusiveListNode m_ready_queue_node;