libavcodec/utils.c:380: error: Null Dereference
  pointer `buf` last assigned on line 370 could be null and is dereferenced at line 380, column 5.

libavcodec/utils.c:363:1: start of procedure avcodec_default_release_buffer()
361. }
362. 
363. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
364.     int i;
365.     InternalBuffer *buf, *last;

libavcodec/utils.c:367:5: 
365.     InternalBuffer *buf, *last;
366. 
367.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
368.     assert(s->internal_buffer_count);
369. 

libavcodec/utils.c:368:5: 
366. 
367.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
368.     assert(s->internal_buffer_count);
         ^
369. 
370.     buf = NULL; /* avoids warning */

libavcodec/utils.c:370:5: 
368.     assert(s->internal_buffer_count);
369. 
370.     buf = NULL; /* avoids warning */
         ^
371.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
372.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:371:9: 
369. 
370.     buf = NULL; /* avoids warning */
371.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
372.         buf= &((InternalBuffer*)s->internal_buffer)[i];
373.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:371:14: Loop condition is false. Leaving loop
369. 
370.     buf = NULL; /* avoids warning */
371.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
372.         buf= &((InternalBuffer*)s->internal_buffer)[i];
373.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:376:5: 
374.             break;
375.     }
376.     assert(i < s->internal_buffer_count);
         ^
377.     s->internal_buffer_count--;
378.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:377:5: 
375.     }
376.     assert(i < s->internal_buffer_count);
377.     s->internal_buffer_count--;
         ^
378.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
379. 

libavcodec/utils.c:378:5: 
376.     assert(i < s->internal_buffer_count);
377.     s->internal_buffer_count--;
378.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
379. 
380.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:380:5: 
378.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
379. 
380.     FFSWAP(InternalBuffer, *buf, *last);
         ^
381. 
382.     for(i=0; i<4; i++){
