Fix crash in LimeSDR start when the device is disconnected

This fixes crash when a device which was enumerated on the
application startup gets disconnected prior to the attempt
to start the radio.

The check is done after the existing work around for the
LimeSuite bug. The idea is to give it the best possible
chance for the radio to start.

Possibly, the check needs needs to happen in the second
LMS_Open() but ideally this needs to be verified against
the original workaround scenario.

source_modules/limesdr_source/src/main.cpp

@@ -330,7 +330,9 @@ private:
         if (err) {
             LMS_Close(_this->openDev);
             LMS_Open(&_this->openDev, _this->devList[_this->devId], NULL);
-            LMS_Init(_this->openDev);
+            if (LMS_Init(_this->openDev) != 0) {
+                return;
+            }
         }
 
         flog::warn("Channel count: {0}", LMS_GetNumChannels(_this->openDev, false));