lms: Allow setting Tx/RxGain for chan!=0

Related: OS#3346
Change-Id: I5fae92a7ed5e2d92be12b9dfd33fc56195030c0b
diff --git a/Transceiver52M/device/lms/LMSDevice.cpp b/Transceiver52M/device/lms/LMSDevice.cpp
index 712652a..21bcece 100644
--- a/Transceiver52M/device/lms/LMSDevice.cpp
+++ b/Transceiver52M/device/lms/LMSDevice.cpp
@@ -322,11 +322,6 @@
 
 double LMSDevice::setTxGain(double dB, size_t chan)
 {
-	if (chan) {
-		LOGC(DDEV, ALERT) << "Invalid channel " << chan;
-		return 0.0;
-	}
-
 	if (dB > maxTxGain())
 		dB = maxTxGain();
 	if (dB < minTxGain())
@@ -342,11 +337,6 @@
 
 double LMSDevice::setRxGain(double dB, size_t chan)
 {
-	if (chan) {
-		LOGC(DDEV, ALERT) << "Invalid channel " << chan;
-		return 0.0;
-	}
-
 	if (dB > maxRxGain())
 		dB = maxRxGain();
 	if (dB < minRxGain())