Mark several non-modified pointer variables const

AvailableMetersPanel.c

@@ -31,7 +31,7 @@ static void AvailableMetersPanel_delete(Object* object) {
 }
 
 static inline void AvailableMetersPanel_addMeter(Header* header, Panel* panel, const MeterClass* type, int param, int column) {
-   Meter* meter = Header_addMeterByClass(header, type, param, column);
+   const Meter* meter = Header_addMeterByClass(header, type, param, column);
    Panel_add(panel, (Object*) Meter_toListItem(meter, false));
    Panel_setSelected(panel, Panel_size(panel) - 1);
    MetersPanel_setMoving((MetersPanel*)panel, true);

MetersPanel.c

@@ -216,7 +216,7 @@ MetersPanel* MetersPanel_new(Settings* settings, const char* header, Vector* met
    this->leftNeighbor = NULL;
    Panel_setHeader(super, header);
    for (int i = 0; i < Vector_size(meters); i++) {
-      Meter* meter = (Meter*) Vector_get(meters, i);
+      const Meter* meter = (const Meter*) Vector_get(meters, i);
       Panel_add(super, (Object*) Meter_toListItem(meter, false));
    }
    return this;

htop.c

@@ -215,7 +215,7 @@ static CommandLineSettings parseArguments(int argc, char** argv) {
             assert(optarg); /* please clang analyzer, cause optarg can be NULL in the 'u' case */
             char* argCopy = xStrdup(optarg);
             char* saveptr;
-            char* pid = strtok_r(argCopy, ",", &saveptr);
+            const char* pid = strtok_r(argCopy, ",", &saveptr);
 
             if(!flags.pidMatchList) {
                flags.pidMatchList = Hashtable_new(8, false);

linux/Platform.c

@@ -754,7 +754,7 @@ static void Platform_Battery_getSysData(double* percent, ACPresence* isOnAC) {
          }
 
          char* buf = buffer;
-         char* line = NULL;
+         const char* line;
          bool full = false;
          bool now = false;
          int fullSize = 0;