Bug 1668926 - ensure SignedStatusRunnable::SignedStatusRunnable mResult is initialized. r=benc

CID 1459799 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)2. uninit_member: Non-static class member mResult is not initialized in this constructor nor in any functions that it calls.

Differential Revision: https://phabricator.services.mozilla.com/D111619

--HG--
extra : rebase_source : 14c1930627170a7c9a9c769856117cb51d72126f

mailnews/mime/src/mimecms.cpp

@@ -286,6 +286,7 @@ SignedStatusRunnable::SignedStatusRunnable(
     int32_t aNestingLevel, int32_t aSignatureStatus, nsIX509Cert* aSignerCert,
     const nsCString& aMsgNeckoURL)
     : mozilla::Runnable("SignedStatusRunnable"),
+      mResult(NS_ERROR_UNEXPECTED),
       m_sink(aSink),
       m_nestingLevel(aNestingLevel),
       m_signatureStatus(aSignatureStatus),