tag unused Cmd [-Wunused-parameter]

client/cmdhf.c

@@ -88,6 +88,7 @@ int CmdHFSearch(const char *Cmd) {
 }
 
 int CmdHFTune(const char *Cmd) {
+    (void)Cmd; // Cmd is not used so far
     PrintAndLogEx(SUCCESS, "Measuring HF antenna, press button to exit");
     UsbCommand c = {CMD_MEASURE_ANTENNA_TUNING_HF};
     clearCommandBuffer();
@@ -137,6 +138,7 @@ int CmdHF(const char *Cmd) {
 }
 
 int CmdHelp(const char *Cmd) {
+    (void)Cmd; // Cmd is not used so far
     CmdsHelp(CommandTable);
     return 0;
 }