Fixed gains.

Author: shajen

sources/radio/sdr_device_reader.cpp

@@ -46,7 +46,15 @@ void SdrDeviceReader::updateDevice(Device& device, const SoapySDR::Kwargs args)
   device.connected = true;
   device.driver = driver;
   device.sample_rates = getSampleRates(sdr);
+  const auto backupGains = device.gains;
   device.gains = getGains(sdr);
+  for (auto& gain : device.gains) {
+    for (auto& backupGain : backupGains) {
+      if (gain.name == backupGain.name) {
+        gain.value = backupGain.value;
+      }
+    }
+  }
 
   SoapySDR::Device::unmake(sdr);
 }