librbd,librados,tools: Initialize aio_comp,m_ variables

** 1414517 Uninitialized pointer field
CID 1414517 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR)
2. uninit_member: Non-static class member aio_comp is not initialized
in this constructor nor in any functions that it calls.

** 1274324 Uninitialized scalar field
2. uninit_member: Non-static class member m_pool_id is not initialized
in this constructor nor in any functions that it calls.
CID 1274324 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
4. uninit_member: Non-static class member m_snap_seq is not initialized
in this constructor nor in any functions that it calls.

** 1356906 Uninitialized scalar field
CID 1356906 (#1-2 of 2): Uninitialized scalar field (UNINIT_CTOR)
5. uninit_member: Non-static class member m_snap_ret is not initialized
in this constructor nor in any functions that it calls.

Signed-off-by: Amit Kumar <amitkuma@redhat.com>

src/test/librados_test_stub/TestIoCtxImpl.h

@@ -185,9 +185,9 @@ class TestIoCtxImpl {
   };
 
   TestRadosClient *m_client;
-  int64_t m_pool_id;
+  int64_t m_pool_id = 0;
   std::string m_pool_name;
-  snap_t m_snap_seq;
+  snap_t m_snap_seq = 0;
   SnapContext m_snapc;
   std::atomic<uint64_t> m_refcount = { 0 };
   std::atomic<uint64_t> m_pending_ops = { 0 };

src/test/librbd/io/test_mock_ImageRequestWQ.cc

@@ -23,7 +23,7 @@ namespace io {
 template <>
 struct ImageRequest<librbd::MockTestImageCtx> {
   static ImageRequest* s_instance;
-  AioCompletion *aio_comp;
+  AioCompletion *aio_comp = nullptr;
 
   static ImageRequest* create_write_request(librbd::MockTestImageCtx &image_ctx,
                                             AioCompletion *aio_comp,

src/tools/rbd_mirror/image_sync/ObjectCopyRequest.h

@@ -116,7 +116,7 @@ class ObjectCopyRequest {
   std::string m_remote_oid;
 
   librados::snap_set_t m_snap_set;
-  int m_snap_ret;
+  int m_snap_ret = 0;
 
   bool m_retry_missing_read = false;
   librados::snap_set_t m_retry_snap_set;