x86/alternative: Convert alternative_io()

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240607111701.8366-7-bp@kernel.org

arch/x86/include/asm/alternative.h

@@ -335,11 +335,7 @@ static inline int alternatives_text_reserved(void *start, void *end)
 
 /* Like alternative_input, but with a single output argument */
 #define alternative_io(oldinstr, newinstr, ft_flags, output, input...)	\
-	asm_inline volatile (ALTERNATIVE(oldinstr, newinstr, ft_flags)	\
-		: output : "i" (0), ## input)
-
-#define n_alternative_io(oldinstr, newinstr, ft_flags, output, input...)	\
-	asm_inline volatile (N_ALTERNATIVE(oldinstr, newinstr, ft_flags)	\
+	asm_inline volatile(N_ALTERNATIVE(oldinstr, newinstr, ft_flags)	\
 		: output : "i" (0), ## input)
 
 /*