dtmail: resolve coverity warnings related to uninitialised members in C++ classes

cde/programs/dtmail/libDtMail/Common/DtMailError.C

@@ -397,6 +397,7 @@ DtMailEnv::DtMailEnv()
   _client = NULL;
   _implClearFunc = NULL;
   _fatal = DTM_FALSE;
+  _error_minor_code = DTME_NoError;
 }
 
 #ifdef hpV4

cde/programs/dtmail/libDtMail/Common/DtMailMailBox.C

@@ -68,6 +68,8 @@ DtMail::MailBox::MailBox(DtMailEnv & error,
     _callback = cb;
     _cb_data = clientData;
     _obj_mutex = MutexInit();
+    _mail_box_writable = DTM_FALSE;
+    _default_mode = 0;
 }
 
 DtMail::MailBox::~MailBox(void)

cde/programs/dtmail/libDtMail/Common/Threads.C

@@ -246,8 +246,11 @@ Condition::Condition(void)
 #if defined(POSIX_THREADS)
     _condition = malloc(sizeof(cond_t));
     cond_init((cond_t *)_condition, USYNC_THREAD, NULL);
+#else
+    _condition = NULL;
 #endif
 
+    _state = 0;
 }
 
 Condition::~Condition(void)

cde/programs/dtmail/libDtMail/RFC/RFCFormat.C

@@ -53,6 +53,7 @@ RFCFormat::RFCFormat(DtMail::Session * session)
 {
     _session = session;
     _is_write_bcc = DTM_FALSE;
+    _use_cr = DTM_FALSE;
 }
 
 RFCFormat::~RFCFormat(void)

cde/programs/dtmail/libDtMail/RFC/RFCMailValues.C

@@ -71,6 +71,7 @@ RFCValue::RFCValue(const char * str, int size) : DtMailValue(NULL)
     _value[size] = 0;
 
     _decoded = NULL;
+    _session = NULL;
 }
 
 RFCValue::RFCValue(const char * str, int size, DtMail::Session *s) : DtMailValue(NULL)

cde/programs/dtmail/libDtMail/RFC/RFCTransport.C

@@ -129,6 +129,9 @@ RFCTransport::RFCTransport(DtMailEnv & error,
     // Set up the handlers so that we are notified when a child
     // process exits and do the right thing.
     signalRegister();
+    
+    _error_proc = NULL;
+    _smd = NULL;
 }
 
 RFCTransport::~RFCTransport(void)