Remove a bad assert() in IOStream dtor

The assert was ok for the regular case, but it would fail if
the guest closed the pipe in the middle of processing because of
some logic error

Change-Id: I9d69f8ea6d9cb0e0cca3b1607fa49b7876be6b14
diff --git a/host/libs/virglrenderer/OpenglRender/IOStream.h b/host/libs/virglrenderer/OpenglRender/IOStream.h
index d6ed8d5..c0d7482 100644
--- a/host/libs/virglrenderer/OpenglRender/IOStream.h
+++ b/host/libs/virglrenderer/OpenglRender/IOStream.h
@@ -29,8 +29,7 @@
 
     ~IOStream() {
         // NOTE: m_buf was owned by the child class thus we expect it to be
-        // released and flushed before the object destruction.
-        assert(!m_buf || m_free == m_bufsize);
+        // released before the object destruction.
     }
 
 public: