transceiver: Do not report error on SETTSC when radio is on

OsmoTRX does not support the use of multiple TSC settings per
internal TRX instance. There should not be an error to modifiy
the TSC value after POWERON. Setting TSC value on TRX channels
other then 0 is a NOP operation that should only error if the
requested TSC differs from that of TRX channel 0.

Reported-by: Max <msuraev@sysmocom.de>
Signed-off-by: Tom Tsou <tom.tsou@ettus.com>
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index cb191d5..d4ca4b9 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -827,7 +827,7 @@
     // set TSC
     unsigned TSC;
     sscanf(buffer, "%3s %s %d", cmdcheck, command, &TSC);
-    if (mOn || (TSC < 0) || (TSC > 7))
+    if ((TSC < 0) || (TSC > 7))
       sprintf(response, "RSP SETTSC 1 %d", TSC);
     else if (chan && (TSC != mTSC))
       sprintf(response, "RSP SETTSC 1 %d", TSC);