use macro instead of magic value

src/StreamEpics.cc

@@ -831,7 +831,7 @@ initRecord(const char* filename, const char* protocol,
         return ERROR;
     }
     debug("Stream::initRecord %s: initialized. %s\n",
-        name(), convert==2 ?
+        name(), convert == DO_NOT_CONVERT ?
             "convert" : "don't convert");
     return convert;
 }
@@ -843,6 +843,7 @@ process()
     debug("Stream::process(%s)\n", name());
     if (record->pact || record->scan == SCAN_IO_EVENT)
     {
+        record->proc = 0;
         if (status != NO_ALARM)
         {
             debug("Stream::process(%s) error status=%s (%d)\n",
@@ -854,7 +855,7 @@ process()
             return false;
         }
         debug("Stream::process(%s) ready. %s\n",
-            name(), convert==2 ?
+            name(), convert == DO_NOT_CONVERT ?
             "convert" : "don't convert");
         return true;
     }
@@ -870,9 +871,13 @@ process()
     convert = OK;
     if (!startProtocol(record->proc == 2 ? StreamCore::StartInit : StreamCore::StartNormal))
     {
-        debug("Stream::process(%s): could not start %sprotocol, status=%d\n",
-            name(), record->proc==2 ? "@init " : "", status);
+        debug("Stream::process(%s): could not start %sprotocol, status=%s (%d)\n",
+            name(), record->proc == 2 ? "@init " : "", 
+                status >= 0 && status < ALARM_NSTATUS ?
+                    epicsAlarmConditionStrings[status] : "ERROR",
+            status);
         (void) recGblSetSevr(record, status ? status : UDF_ALARM, INVALID_ALARM);
+        record->proc = 0;
         return false;
     }
     debug("Stream::process(%s): protocol started\n", name());