Do not call libsensors init or cleanup functions from plugin

Doing so multiple times in the same process will lead to crashes.

plugins/cpu/linuxcpuplugin.cpp

@@ -11,6 +11,7 @@
 #include <KLocalizedString>
 
 #include <systemstats/SensorContainer.h>
+#include <systemstats/SensorPlugin.h>
 
 #ifdef HAVE_SENSORS
 #include <sensors/sensors.h>
@@ -127,7 +128,9 @@ void LinuxCpuPluginPrivate::update()
 void LinuxCpuPluginPrivate::addSensors()
 {
 #ifdef HAVE_SENSORS
-    sensors_init(nullptr);
+    if (!KSysGuard::SensorPlugin::initLibSensors()) {
+        return;
+    }
     int number = 0;
     while (const sensors_chip_name * const chipName = sensors_get_detected_chips(nullptr, &number)) {
         char name[100];

plugins/lmsensors/lmsensors.cpp

@@ -20,7 +20,7 @@ LmSensorsPlugin::LmSensorsPlugin(QObject *parent, const QVariantList &args)
     : KSysGuard::SensorPlugin(parent, args)
 {
     auto container = new KSysGuard::SensorContainer(QStringLiteral("lmsensors"), i18n( "Hardware Sensors" ), this);
-    if (sensors_init(nullptr) != 0) {
+    if (!initLibSensors()) {
         return;
     }
 
@@ -50,7 +50,6 @@ LmSensorsPlugin::LmSensorsPlugin(QObject *parent, const QVariantList &args)
 
 LmSensorsPlugin::~LmSensorsPlugin()
 {
-    sensors_cleanup();
 }