Fixed some compile-time warnings

src/el734Controller.cpp

@@ -36,6 +36,7 @@ el734Controller::el734Controller(const char *portName,
       pEl734C_(std::make_unique<el734ControllerImpl>((el734ControllerImpl){
           .comTimeout = comTimeout,
           .lastResponse = {0},
+          .pasynInt32SyncIOipPort = nullptr,
           .limFromHardware = 0,
       }))
 
@@ -127,10 +128,8 @@ asynStatus el734Controller::writeRead(int axisNo, const char *command,
 
     // Definition of local variables.
     asynStatus status = asynSuccess;
-    asynStatus timeoutStatus = asynSuccess;
     char drvMessageText[MAXBUF_] = {0};
     int motorStatusProblem = 0;
-    int numReceivedResponses = 0;
 
     /*
     asyn defines the following reasons for an end-of-message coming from the MCU
@@ -354,8 +353,9 @@ static const iocshArg CreateControllerArg5 = {"Communication timeout (s)",
 static const iocshArg *const CreateControllerArgs[] = {
     &CreateControllerArg0, &CreateControllerArg1, &CreateControllerArg2,
     &CreateControllerArg3, &CreateControllerArg4, &CreateControllerArg5};
-static const iocshFuncDef configEl734CreateController = {"el734Controller", 6,
-                                                         CreateControllerArgs};
+static const iocshFuncDef configEl734CreateController = {
+    "el734Controller", 6, CreateControllerArgs,
+    "Create a new instance of an EL734 controller."};
 static void configEl734CreateControllerCallFunc(const iocshArgBuf *args) {
     el734CreateController(args[0].sval, args[1].sval, args[2].ival,
                           args[3].dval, args[4].dval, args[5].dval);