Fix two small memory leaks

Author: baconz

Source/C++/Core/Ap4CommonEncryption.cpp

@@ -1873,6 +1873,8 @@ class AP4_CencFragmentDecrypter : public AP4_Processor::FragmentHandler {
     m_SaizAtom(saiz_atom),
     m_SampleEncryptionAtom(sample_encryption_atom) {}
 
+    ~AP4_CencFragmentDecrypter() { delete m_SampleDecrypter; }
+
     // methods
     virtual AP4_Result ProcessFragment();
     virtual AP4_Result FinishFragment();

Source/C++/Core/Ap4SampleDescription.h

@@ -304,7 +304,9 @@ class AP4_AvcSampleDescription : public AP4_SampleDescription,
                              AP4_UI08                         nalu_length_size,
                              const AP4_Array<AP4_DataBuffer>& sequence_parameters,
                              const AP4_Array<AP4_DataBuffer>& picture_parameters);
-    
+
+    ~AP4_AvcSampleDescription() { delete m_AvccAtom; }
+
     // accessors
     AP4_UI08 GetConfigurationVersion() const { return m_AvccAtom->GetConfigurationVersion(); }
     AP4_UI08 GetProfile() const { return m_AvccAtom->GetProfile(); }