[Fix] Fix the bug of uninitialized prarmeter (#2345)

* [Fix] Fix the bug of uninitialized prarmeter

* refactor code for lint
Co-authored-by: budefei <budefei@cambricon.com>

mmcv/ops/csrc/common/pytorch_mlu_helper.hpp

@@ -27,6 +27,7 @@
 
 inline int32_t getJobLimitCapability() {
   CNcontext drv_ctx;
+  TORCH_CHECK(CN_SUCCESS == cnCtxGetCurrent(&drv_ctx), "cnCtxGetCurrent fails");
   CNctxConfigParam ctx_conf_param;
   TORCH_CHECK(
       CN_SUCCESS == cnGetCtxConfigParam(drv_ctx, CN_CTX_CONFIG_UNION_LIMIT,