avcodec/h261dec: Don't initialize unused VLCs

The H.261 decoder uses only the very first VLC of ff_h261_rl_tcoeff,
so only initialize this one. Saves 68448B from the .bss segment; in case
the decoder is actually used, this amount of memory is saved.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/h261dec.c

@@ -65,7 +65,7 @@ static av_cold void h261_decode_init_vlc(H261Context *h)
         INIT_VLC_STATIC(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
                         &ff_h261_cbp_tab[0][1], 2, 1,
                         &ff_h261_cbp_tab[0][0], 2, 1, 512);
-        INIT_VLC_RL(ff_h261_rl_tcoeff, 552);
+        INIT_FIRST_VLC_RL(ff_h261_rl_tcoeff, 552);
     }
 }