libavcodec/utils.c:366: error: Null Dereference
  pointer `buf` last assigned on line 356 could be null and is dereferenced at line 366, column 5.

libavcodec/utils.c:349:1: start of procedure avcodec_default_release_buffer()
347. }
348. 
349. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
350.     int i;
351.     InternalBuffer *buf, *last;

libavcodec/utils.c:353:5: 
351.     InternalBuffer *buf, *last;
352. 
353.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
354.     assert(s->internal_buffer_count);
355. 

libavcodec/utils.c:354:5: 
352. 
353.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
354.     assert(s->internal_buffer_count);
         ^
355. 
356.     buf = NULL; /* avoids warning */

libavcodec/utils.c:356:5: 
354.     assert(s->internal_buffer_count);
355. 
356.     buf = NULL; /* avoids warning */
         ^
357.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
358.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:357:9: 
355. 
356.     buf = NULL; /* avoids warning */
357.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
358.         buf= &((InternalBuffer*)s->internal_buffer)[i];
359.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:357:14: Loop condition is false. Leaving loop
355. 
356.     buf = NULL; /* avoids warning */
357.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
358.         buf= &((InternalBuffer*)s->internal_buffer)[i];
359.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:362:5: 
360.             break;
361.     }
362.     assert(i < s->internal_buffer_count);
         ^
363.     s->internal_buffer_count--;
364.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:363:5: 
361.     }
362.     assert(i < s->internal_buffer_count);
363.     s->internal_buffer_count--;
         ^
364.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
365. 

libavcodec/utils.c:364:5: 
362.     assert(i < s->internal_buffer_count);
363.     s->internal_buffer_count--;
364.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
365. 
366.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:366:5: 
364.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
365. 
366.     FFSWAP(InternalBuffer, *buf, *last);
         ^
367. 
368.     for(i=0; i<4; i++){
