command_export_pcb_dxf.cpp: switch to "C" locale before exporting the file

Fix also a minor Coverity warning

common/cli/command_export_pcb_dxf.cpp

@@ -29,6 +29,8 @@
 #include <macros.h>
 #include <wx/tokenzr.h>
 
+#include <locale_io.h>
+
 #define ARG_LAYERS "--layers"
 #define ARG_INCLUDE_REFDES "--include-refdes"
 #define ARG_INCLUDE_VALUE "--include-value"
@@ -101,6 +103,7 @@ int CLI::EXPORT_PCB_DXF_COMMAND::Perform( KIWAY& aKiway ) const
 
     dxfJob->m_printMaskLayer = layerMask;
 
+    LOCALE_IO dummy;    // Switch to "C" locale
     int exitCode = aKiway.ProcessJob( KIWAY::FACE_PCB, dxfJob.get() );
 
     return exitCode;

eeschema/sim/sim_model_kibis.cpp

@@ -221,6 +221,7 @@ std::string SPICE_GENERATOR_KIBIS::IbisDevice( const SPICE_ITEM& aItem, const st
 
 SIM_MODEL_KIBIS::SIM_MODEL_KIBIS( TYPE aType ) :
         SIM_MODEL( aType, std::make_unique<SPICE_GENERATOR_KIBIS>( *this ) ),
+        m_enableDiff( false ),
         m_sourceModel( nullptr )
 {
     static std::vector<PARAM::INFO> device = makeParamInfos( TYPE::KIBIS_DEVICE );