fix bugs

stmms-biz/src/main/java/cn/com/qmth/stmms/biz/exam/service/impl/ExamStudentServiceImpl.java

@@ -904,8 +904,9 @@ public class ExamStudentServiceImpl extends BaseQueryService<ExamStudent> implem
         }
         if (sliceConfigFix && student.getSliceCount() > sliceConfig.size()) {
             int picCount = student.getSliceCount() - sliceConfig.size();
+            int sliceConfigSize = sliceConfig.size();
             for (int i = 1; i <= picCount; i++) {
-                PictureConfigItem e = new PictureConfigItem(sliceConfig.size() + i);
+                PictureConfigItem e = new PictureConfigItem(sliceConfigSize + i);
                 sliceConfig.add(e);
             }
         }