fix bug

mallinkService/src/main/java/com/iformall/service/impl/WxCouponChannelServiceImpl.java

@@ -711,19 +711,19 @@ public class WxCouponChannelServiceImpl implements WxCouponChannelService {
 		//释放渠道库存
 		WxCouponChannel couponChannel = wxCouponChannelMapper.selectById(record.getId(), record.getTenantId());
 		if(null == couponChannel.getChannelStock()){
-            throw new MallinkException(ErrorCode.REMAIN_BACK_FAIL.getCode(),"暂无可释放库存");
+            throw new MallinkException(ErrorCode.REMAIN_BACK_FAIL.getCode(),"库存已经释放，无需再次操作.");
         }
-
 		int num = wxCouponChannelMapper.clearChannelStock(record.getId(), record.getTenantId());
 		if (num == 0) {
             throw new MallinkException(ErrorCode.REMAIN_BACK_FAIL);
         }
-		
-		//减掉券库存
-		int num1 = wxCouponMapper.backInventory(record.getCouponId(), record.getTenantId(), couponChannel.getChannelStock());
-		if (num1 == 0) {
-            throw new MallinkException(ErrorCode.REMAIN_BACK_FAIL);
-        }
+		if (couponChannel.getChannelStock() > 0 ) {
+			//减掉券库存
+			int num1 = wxCouponMapper.backInventory(record.getCouponId(), record.getTenantId(), couponChannel.getChannelStock());
+			if (num1 == 0) {
+	            throw new MallinkException(ErrorCode.REMAIN_BACK_FAIL);
+	        }
+		}
 	}
 
 	@Override