Remove unused static data

This affects struct rspMsg in usbtmc_app.c (unconditionally) and uint8_t
termChar in usbtmc_device.c (when NDEBUG is defined). IAR generates warning
Pe550 'variable was set but never used'.

Author: Ben Avison

examples/device/usbtmc/src/usbtmc_app.c

@@ -92,14 +92,6 @@ static size_t buffer_tx_ix; // for transmitting using multiple transfers
 static uint8_t buffer[225]; // A few packets long should be enough.
 
 
-static usbtmc_msg_dev_dep_msg_in_header_t rspMsg = {
-    .bmTransferAttributes =
-    {
-      .EOM = 1,
-      .UsingTermChar = 0
-    }
-};
-
 void tud_usbtmc_open_cb(uint8_t interface_id)
 {
   (void)interface_id;
@@ -188,9 +180,6 @@ static unsigned int msgReqLen;
 
 bool tud_usbtmc_msgBulkIn_request_cb(usbtmc_msg_request_dev_dep_in const * request)
 {
-  rspMsg.header.MsgID = request->header.MsgID,
-  rspMsg.header.bTag = request->header.bTag,
-  rspMsg.header.bTagInverse = request->header.bTagInverse;
   msgReqLen = request->TransferSize;
 
 #ifdef xDEBUG

src/class/usbtmc/usbtmc_device.c

@@ -154,7 +154,9 @@ TU_VERIFY_STATIC(USBTMCD_BUFFER_SIZE >= 32u,"USBTMC dev buffer size too small");
 static bool handle_devMsgOutStart(uint8_t rhport, void *data, size_t len);
 static bool handle_devMsgOut(uint8_t rhport, void *data, size_t len, size_t packetLen);
 
+#ifndef NDEBUG
 static uint8_t termChar;
+#endif
 static uint8_t termCharRequested = false;
 
 osal_mutex_def_t usbtmcLockBuffer;
@@ -440,7 +442,9 @@ static bool handle_devMsgIn(void *data, size_t len)
   usbtmc_state.transfer_size_sent = 0u;
 
   termCharRequested = msg->bmTransferAttributes.TermCharEnabled;
+#ifndef NDEBUG
   termChar = msg->TermChar;
+#endif
 
   if(termCharRequested)
     TU_VERIFY(usbtmc_state.capabilities->bmDevCapabilities.canEndBulkInOnTermChar);