x86: assign nr_ioapics = 0 in smpboot_hooks.h

change smpboot_setup_io_apic() by to match x86_64 behaviour
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/asm-x86/mach-default/smpboot_hooks.h

@@ -41,4 +41,6 @@ static inline void smpboot_setup_io_apic(void)
 	 */
 	if (!skip_ioapic_setup && nr_ioapics)
 		setup_IO_APIC();
+	else
+		nr_ioapics = 0;
 }