fix some warnings

libs/main/io_devices/pican.cpp

@@ -43,6 +43,7 @@ PICAN::PICAN(const PIString & path, PIIODevice::DeviceMode mode) : PIIODevice(pa
 	setThreadedReadBufferSize(256);
 	setPath(path);
 	can_id = 0;
+	sock = 0;
 }
 
 

libs/main/io_devices/pigpio.cpp

@@ -26,10 +26,6 @@
 #  include <unistd.h>
 #  include <cstdlib>
 #endif
-#ifdef __GNUC__
-#  pragma GCC diagnostic push
-#  pragma GCC diagnostic ignored "-Wunused-but-set-variable"
-#endif
 
 
 /*! \class PIGPIO