Free the GifPlainText object when complete.

core/fxcodec/lgif/fx_gif.cpp

Index: core/fxcodec/lgif/fx_gif.cpp
diff --git a/core/fxcodec/lgif/fx_gif.cpp b/core/fxcodec/lgif/fx_gif.cpp
index b94445ccf3eee7d8a710c9ebf9f5865cbc2e36e4..08b008ddb45fd98330cb465d3c9ac1f0f0644394 100644
--- a/core/fxcodec/lgif/fx_gif.cpp
+++ b/core/fxcodec/lgif/fx_gif.cpp
@@ -418,6 +418,7 @@ void gif_destroy_decompress(gif_decompress_struct_pp gif_ptr_ptr) {
       FX_Free(p->gce_ptr);
       FX_Free(p->pte_ptr);
       delete p->string_ptr;
+      FX_Free(p);
     }
     gif_ptr->pt_ptr_arr_ptr->RemoveAll();
     delete gif_ptr->pt_ptr_arr_ptr;