librados: fix MWatchNotify leak

Do not leak the message if the watcher is not registered.  Also, simplify
this block.

Fixes (part of): #5949
Backport: dumpling, cuttlefish
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

1 files changed, 6 insertions, 9 deletions

diff --git a/src/librados/RadosClient.cc b/src/librados/RadosClient.cc
index 48b6a3cabf6..8a5f499ec15 100644
--- a/src/librados/RadosClient.cc
+++ b/src/librados/RadosClient.cc
@@ -563,16 +563,13 @@ public:
 void librados::RadosClient::watch_notify(MWatchNotify *m)
 {
   assert(lock.is_locked());
-  WatchContext *wc = NULL;
   map<uint64_t, WatchContext *>::iterator iter = watchers.find(m->cookie);
-  if (iter != watchers.end())
-    wc = iter->second;
-
-  if (!wc)
-    return;
-
-  wc->get();
-  finisher.queue(new C_WatchNotify(wc, &lock, m->opcode, m->ver, m->notify_id, m->bl));
+  if (iter != watchers.end()) {
+    WatchContext *wc = iter->second;
+    assert(wc);
+    wc->get();
+    finisher.queue(new C_WatchNotify(wc, &lock, m->opcode, m->ver, m->notify_id, m->bl));
+  }
   m->put();
 }