mss4, ra288: Remove unused DSPContext local codec context members

libavcodec/mss4.c

@@ -126,7 +126,6 @@ static const uint8_t mss4_vec_entry_vlc_syms[2][9] = {
 
 typedef struct MSS4Context {
     AVFrame    pic;
-    DSPContext dsp;
 
     VLC        dc_vlc[2], ac_vlc[2];
     VLC        vec_entry_vlc[2];

libavcodec/ra288.c

@@ -39,7 +39,6 @@
 
 typedef struct {
     AVFrame frame;
-    DSPContext dsp;
     AVFloatDSPContext fdsp;
     DECLARE_ALIGNED(32, float,   sp_lpc)[FFALIGN(36, 16)];   ///< LPC coefficients for speech data (spec: A)
     DECLARE_ALIGNED(32, float, gain_lpc)[FFALIGN(10, 16)];   ///< LPC coefficients for gain        (spec: GB)