CLEANUP: some compiler and static analysis warnings

src/sdr/SDRDeviceInfo.h

@@ -89,7 +89,7 @@ public:
     SDRRangeMap getGains(int direction, size_t channel);
 
 private:
-    int index;
+    int index = 0;
     std::string name, serial, product, manufacturer, tuner;
     std::string driver, hardware, manual_params;
     bool timestamps, available, remote, manual;

src/sdr/SDRPostThread.h

@@ -45,7 +45,7 @@ private:
     std::vector<liquid_float_complex> fpData;
     std::vector<liquid_float_complex> dataOut;
     std::vector<long long> chanCenters;
-    long long chanBw;
+    long long chanBw = 0;
     
     size_t nRunDemods;
     std::vector<DemodulatorInstance *> runDemods;