Merge pull request #13935 from chuang-he/fix_mutex_locker_of_compressor

compressor: fix Mutex::Locker used is not correct

Reviewed-by: Igor Fedotov <ifedotov@mirantis.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

src/compressor/AsyncCompressor.h

@@ -78,7 +78,7 @@ class AsyncCompressor {
         if (item->status.compare_and_swap(WAIT, WORKING)) {
           break;
         } else {
-          Mutex::Locker (async_compressor->job_lock);
+          Mutex::Locker l(async_compressor->job_lock);
           async_compressor->jobs.erase(item->id);
           item = NULL;
         }