x86/idt: Remove update_intr_gate()

No more users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/include/asm/desc.h

@@ -386,7 +386,6 @@ static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
 	desc->limit1 = (limit >> 16) & 0xf;
 }
 
-void update_intr_gate(unsigned int n, const void *addr);
 void alloc_intr_gate(unsigned int n, const void *addr);
 
 extern unsigned long system_vectors[];

arch/x86/kernel/idt.c

@@ -360,14 +360,6 @@ void idt_invalidate(void *addr)
 	load_idt(&idt);
 }
 
-/* This goes away once ASYNC_PF is sanitized */
-void __init update_intr_gate(unsigned int n, const void *addr)
-{
-	if (WARN_ON_ONCE(!test_bit(n, system_vectors)))
-		return;
-	set_intr_gate(n, addr);
-}
-
 void __init alloc_intr_gate(unsigned int n, const void *addr)
 {
 	if (WARN_ON(n < FIRST_SYSTEM_VECTOR))