[patch] x86, NMI: add to_cpumask() to silence compile warning

[Dan Carpenter]

Gcc complains if we don't cast this to a struct cpumask pointer.
arch/x86/kernel/nmi_selftest.c:93:2:
	warning: passing argument 1 of âcpumask_emptyâ from
	incompatible pointer type [enabled by default]

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index 1e42a23..0d01a8e 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -90,7 +90,7 @@ static void remote_ipi(void)
 {
 	cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask);
 	cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
-	if (!cpumask_empty(nmi_ipi_mask))
+	if (!cpumask_empty(to_cpumask(nmi_ipi_mask)))
 		test_nmi_ipi(to_cpumask(nmi_ipi_mask));
 }

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