Fix leak in chip-tool when using "any" commands. (project-chip#34461)

We were not properly cleaning up the buffer in a CustomArgument when a command
using it finished.

Addresses the main part of project-chip#34221

Author: bzbarsky-apple

examples/chip-tool/commands/clusters/CustomArgument.h

@@ -230,13 +230,7 @@ class CustomArgumentParser
 class CustomArgument
 {
 public:
-    ~CustomArgument()
-    {
-        if (mData != nullptr)
-        {
-            chip::Platform::MemoryFree(mData);
-        }
-    }
+    ~CustomArgument() { Reset(); }
 
     CHIP_ERROR Parse(const char * label, const char * json)
     {
@@ -286,6 +280,15 @@ class CustomArgument
         return writer.CopyElement(tag, reader);
     }
 
+    void Reset()
+    {
+        if (mData != nullptr)
+        {
+            chip::Platform::MemoryFree(mData);
+            mData = nullptr;
+        }
+    }
+
     // We trust our consumers to do the encoding of our data correctly, so don't
     // need to know whether we are being encoded for a write.
     static constexpr bool kIsFabricScoped = false;

examples/chip-tool/commands/common/Command.cpp

@@ -1069,6 +1069,11 @@ void Command::ResetArguments()
                 auto vectorArgument = static_cast<std::vector<uint32_t> *>(arg.value);
                 vectorArgument->clear();
             }
+            else if (type == ArgumentType::Custom)
+            {
+                auto argument = static_cast<CustomArgument *>(arg.value);
+                argument->Reset();
+            }
             else if (type == ArgumentType::VectorCustom)
             {
                 auto vectorArgument = static_cast<std::vector<CustomArgument *> *>(arg.value);