sh: Fix up IRQ re-enabling for the need_resched() case.

In the case where need_resched() is set in between the cpu_idle() and
pm_idle() calls we were missing an else case for just re-enabling local
IRQs and bailing out. This was noticed by the irqs_disabled() warning,
even though IRQs were being re-enabled elsewhere.

Signed-off-by: Paul Mundt <[e-mail]>

arch/sh/kernel/idle.c

···
 		if (!need_resched()) {
 			local_irq_enable();
 			cpu_sleep();
-		}
+		} else
+			local_irq_enable();
 
 		set_thread_flag(TIF_POLLING_NRFLAG);
 	} else