mm/pdflush.c: merge the same code in two path

Signed-off-by: Denis Cheng <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/pdflush.c

···
 
 	spin_lock_irqsave(&pdflush_lock, flags);
 	if (list_empty(&pdflush_list)) {
-		spin_unlock_irqrestore(&pdflush_lock, flags);
 		ret = -1;
 	} else {
 		struct pdflush_work *pdf;
···
 		pdf->fn = fn;
 		pdf->arg0 = arg0;
 		wake_up_process(pdf->who);
-		spin_unlock_irqrestore(&pdflush_lock, flags);
 	}
+	spin_unlock_irqrestore(&pdflush_lock, flags);
+
 	return ret;
 }