hw/arm_gic: Remove stray hardcoded tab

Remove the single instance of a hardcoded tab from hw/arm_gic.c.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/arm_gic.c b/hw/arm_gic.c
index ba6117a..72298b4 100644
--- a/hw/arm_gic.c
+++ b/hw/arm_gic.c
@@ -160,7 +160,7 @@
         cm = 1 << cpu;
         s->current_pending[cpu] = 1023;
         if (!s->enabled || !s->cpu_enabled[cpu]) {
-	    qemu_irq_lower(s->parent_irq[cpu]);
+            qemu_irq_lower(s->parent_irq[cpu]);
             return;
         }
         best_prio = 0x100;