lavc/hevc_ps: use skip_bits instead of get_bits when skip bits.

use skip_bits when want to skip some bits.
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

libavcodec/hevc_ps.c

@@ -1679,7 +1679,7 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
 
     if (get_bits1(gb)) { // pps_extension_present_flag
         int pps_range_extensions_flag = get_bits1(gb);
-        /* int pps_extension_7bits = */ get_bits(gb, 7);
+        skip_bits(gb, 7); // pps_extension_7bits
         if (sps->ptl.general_ptl.profile_idc == FF_PROFILE_HEVC_REXT && pps_range_extensions_flag) {
             if ((ret = pps_range_extensions(gb, avctx, pps, sps)) < 0)
                 goto err;