fix uninitialized variable. #59673. sr=alecf

mailnews/base/src/nsMsgMessageDataSource.cpp

@@ -1528,7 +1528,7 @@ nsresult
 nsMsgMessageDataSource::createPriorityString(nsMsgPriorityValue priority, nsAutoString &priorityStr)
 {
 	nsresult rv = NS_OK;
-	PRUnichar *prustr;
+	PRUnichar *prustr = nsnull;
 	priorityStr.Assign(NS_LITERAL_STRING(" "));
 	switch (priority)
 	{

mailnews/imap/src/nsImapService.cpp

@@ -2886,7 +2886,7 @@ nsImapService::GetDefaultLocalPath(nsIFileSpec ** aResult)
     NS_WITH_SERVICE(nsIPref, prefs, kPrefCID, &rv);
     if (NS_FAILED(rv)) return rv;
     
-    PRBool havePref;
+    PRBool havePref = PR_FALSE;
     nsCOMPtr<nsILocalFile> prefLocal;
     nsCOMPtr<nsIFile> localFile;
     rv = prefs->GetFileXPref(PREF_MAIL_ROOT_IMAP, getter_AddRefs(prefLocal));