powerpc/perf: Fix misleading comment in pmao_restore_workaround()

The current comment in pmao_restore_workaround() regarding
hard_irq_disable() is wrong. It should say to hard *disable* interrupts
instead of *enable*. Fix it.
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/perf/core-book3s.c

@@ -651,7 +651,7 @@ static void pmao_restore_workaround(bool ebb)
 
 	/*
 	 * We are already soft-disabled in power_pmu_enable(). We need to hard
-	 * enable to actually prevent the PMU exception from firing.
+	 * disable to actually prevent the PMU exception from firing.
 	 */
 	hard_irq_disable();