Coverity analysis defect 134193: Freed internal location read

Freed internal location read

Reading from freed memory can cause wrong values to be read and crashes due to illegal memory accesses. Reads target of a freed internal pointer
/src/mongo/db/s/global_index/global_index_cloning_service.cpp:430: WRAPPER_ESCAPE 134193 Calling "front" which extracts wrapped state from "this->this->_fetchedDocs".
/src/mongo/db/s/global_index/global_index_cloning_service.cpp:430: WRAPPER_ESCAPE 134193 Assigning: "next" = "this->this->_fetchedDocs.front()".
/src/mongo/db/s/global_index/global_index_cloning_service.cpp:439: WRAPPER_ESCAPE 134193 Calling "pop" invalidates the internal representation of "this->this->_fetchedDocs".
/src/mongo/db/s/global_index/global_index_cloning_service.cpp:441: WRAPPER_ESCAPE 134193 Using invalidated internal representation of "this->this->_fetchedDocs".