优化修改代码

mvs_u_takephoto/takephoto.c

@@ -284,7 +284,7 @@ int SetSysUsbfsMemSize(int val)
 int GetUsbCameraCount()
 {
   MV_CC_DEVICE_INFO_LIST devList = { 0 };
-  MV_CC_DEVICE_INFO *pDevInfo; int ret;
+  int ret;
 
   ret = MV_CC_Initialize();
   if(MV_OK != ret)