x86/entry/64: Remove error_exit()

No more users.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202118.516757524@linutronix.de

arch/x86/entry/entry_64.S

@@ -1356,15 +1356,6 @@ SYM_CODE_START_LOCAL(error_entry)
 	jmp	.Lerror_entry_from_usermode_after_swapgs
 SYM_CODE_END(error_entry)
 
-SYM_CODE_START_LOCAL(error_exit)
-	UNWIND_HINT_REGS
-	DISABLE_INTERRUPTS(CLBR_ANY)
-	TRACE_IRQS_OFF
-	testb	$3, CS(%rsp)
-	jz	retint_kernel
-	jmp	.Lretint_user
-SYM_CODE_END(error_exit)
-
 SYM_CODE_START_LOCAL(error_return)
 	UNWIND_HINT_REGS
 	DEBUG_ENTRY_ASSERT_IRQS_OFF