nds32: ex-exit: Remove unneeded need_resched() loop

Since the enabling and disabling of IRQs within preempt_schedule_irq()
is contained in a need_resched() loop, we don't need the outer arch
code loop.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>

arch/nds32/kernel/ex-exit.S

@@ -163,7 +163,7 @@ resume_kernel:
 	gie_disable
 	lwi	$t0, [tsk+#TSK_TI_PREEMPT]
 	bnez	$t0, no_work_pending
-need_resched:
+
 	lwi	$t0, [tsk+#TSK_TI_FLAGS]
 	andi	$p1, $t0, #_TIF_NEED_RESCHED
 	beqz	$p1, no_work_pending
@@ -173,7 +173,7 @@ need_resched:
 	beqz	$t0, no_work_pending
 
 	jal	preempt_schedule_irq
-	b	need_resched
+	b	no_work_pending
 #endif
 
 /*