avoid calling mplx again if eos on input is known
avoid calling mplx again if eos on input is known

r4-keisuke/mod_h2,r4-keisuke/mod_h2,r4-keisuke/mod_h2,icing/mod_h2,r4-keisuke/mod_h2,r4-keisuke/mod_h2,icing/mod_h2,icing/mod_h2,icing/mod_h2,icing/mod_h2,r4-keisuke/mod_h2