[PATCH -next] x86/xen: fix 'nopvspin' build error

[Randy Dunlap <rdunlap@infradead.org>]

Fix build error in x86/xen/ when PARAVIRT_SPINLOCKS is not enabled.

Fixes this build error:

../arch/x86/xen/smp_hvm.c: In function ‘xen_hvm_smp_init’:
../arch/x86/xen/smp_hvm.c:77:3: error: ‘nopvspin’ undeclared (first use in this function)
   nopvspin = true;

Fixes: 3d7746bea925 ("x86/xen: Fix xen_hvm_smp_init() when vector callback not available")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Juergen Gross <jgross@suse.com>
---
I tried to use IS_ENABLED(CONFIG_PARAVIRT_SPINLOCKS) on the if line
and on the nopvspin assignment line but both of those failed for me--
using gcc 7.5.0.

 arch/x86/xen/smp_hvm.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20210115.orig/arch/x86/xen/smp_hvm.c
+++ linux-next-20210115/arch/x86/xen/smp_hvm.c
@@ -74,7 +74,9 @@ void __init xen_hvm_smp_init(void)
 	smp_ops.cpu_die = xen_hvm_cpu_die;
 
 	if (!xen_have_vector_callback) {
+#ifdef CONFIG_PARAVIRT_SPINLOCKS
 		nopvspin = true;
+#endif
 		return;
 	}