libavcodec/utils.c:379: error: Null Dereference
  pointer `buf` last assigned on line 369 could be null and is dereferenced at line 379, column 5.

libavcodec/utils.c:362:1: start of procedure avcodec_default_release_buffer()
360. }
361. 
362. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
363.     int i;
364.     InternalBuffer *buf, *last;

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

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

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

libavcodec/utils.c:370:9: 
368. 
369.     buf = NULL; /* avoids warning */
370.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
371.         buf= &((InternalBuffer*)s->internal_buffer)[i];
372.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:370:14: Loop condition is false. Leaving loop
368. 
369.     buf = NULL; /* avoids warning */
370.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
371.         buf= &((InternalBuffer*)s->internal_buffer)[i];
372.         if(buf->data[0] == pic->data[0])

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

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

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

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