fix: remove rb_gc_mark from ZSTD context

Author: SpringMT

ext/zstdruby/streaming_compress.c

@@ -11,7 +11,7 @@ static void
 streaming_compress_mark(void *p)
 {
   struct streaming_compress_t *sc = p;
-  rb_gc_mark((VALUE)sc->ctx);
+  // rb_gc_mark((VALUE)sc->ctx);
   rb_gc_mark(sc->buf);
   rb_gc_mark(sc->buf_size);
 }

ext/zstdruby/streaming_decompress.c

@@ -10,7 +10,7 @@ static void
 streaming_decompress_mark(void *p)
 {
   struct streaming_decompress_t *sd = p;
-  rb_gc_mark((VALUE)sd->ctx);
+  // rb_gc_mark((VALUE)sd->ctx);
   rb_gc_mark(sd->buf);
   rb_gc_mark(sd->buf_size);
 }

spec/zstd-ruby-streaming-compress_spec.rb

@@ -11,6 +11,17 @@
     end
   end
 
+  describe '<< + GC.compat' do
+    it 'shoud work' do
+      stream = Zstd::StreamingCompress.new
+      stream << "abc" << "def"
+      GC.compact
+      stream << "ghi"
+      res = stream.finish
+      expect(Zstd.decompress(res)).to eq('abcdefghi')
+    end
+  end
+
   describe '<< + flush' do
     it 'shoud work' do
       stream = Zstd::StreamingCompress.new