x86/apic: do not clear nr_irqs_gsi if no legacy irqs

nr_legacy_irqs is set in probe_nr_irqs_gsi, we should not clear it after that. Otherwise, the result is that MSI irqs will be allocated from the wrong range for the systems without legacy PIC.

---
 arch/x86/kernel/apic/io_apic.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

index d99388a..5592462 100644
@@ -155,10 +155,8 @@ int __init arch_early_irq_init(void)
 	int node;
 	int i;
 
-	if (!legacy_pic->nr_legacy_irqs) {
-		nr_irqs_gsi = 0;
+	if (!legacy_pic->nr_legacy_irqs)
 		io_apic_irqs = ~0UL;
-	}
 
 	cfg = irq_cfgx;
 	count = ARRAY_SIZE(irq_cfgx);

1.6.3.3