avcodec/h2645_parse: Remove H2645NAL.rbsp_buffer

Forgotten in 03b82b3a.

(Moving data to the front is only done to make existing
initializations like H2645NAL nal = { NULL } not emit int->pointer
conversion warnings.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/h2645_parse.c

@@ -92,8 +92,7 @@ int ff_h2645_extract_rbsp(const uint8_t *src, int length,
     } else if (i > length)
         i = length;
 
-    nal->rbsp_buffer = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
-    dst = nal->rbsp_buffer;
+    dst = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
 
     memcpy(dst, src, i);
     si = di = i;

libavcodec/h2645_parse.h

@@ -32,10 +32,8 @@
 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
 
 typedef struct H2645NAL {
-    uint8_t *rbsp_buffer;
-
-    int size;
     const uint8_t *data;
+    int size;
 
     /**
      * Size, in bits, of just the data, excluding the stop bit and any trailing