libavcodec/utils.c:371: error: Null Dereference
  pointer `buf` last assigned on line 361 could be null and is dereferenced at line 371, column 5.

libavcodec/utils.c:354:1: start of procedure avcodec_default_release_buffer()
352. }
353. 
354. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
355.     int i;
356.     InternalBuffer *buf, *last;

libavcodec/utils.c:358:5: 
356.     InternalBuffer *buf, *last;
357. 
358.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
359.     assert(s->internal_buffer_count);
360. 

libavcodec/utils.c:359:5: 
357. 
358.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
359.     assert(s->internal_buffer_count);
         ^
360. 
361.     buf = NULL; /* avoids warning */

libavcodec/utils.c:361:5: 
359.     assert(s->internal_buffer_count);
360. 
361.     buf = NULL; /* avoids warning */
         ^
362.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
363.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:362:9: 
360. 
361.     buf = NULL; /* avoids warning */
362.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
363.         buf= &((InternalBuffer*)s->internal_buffer)[i];
364.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:362:14: Loop condition is false. Leaving loop
360. 
361.     buf = NULL; /* avoids warning */
362.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
363.         buf= &((InternalBuffer*)s->internal_buffer)[i];
364.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:367:5: 
365.             break;
366.     }
367.     assert(i < s->internal_buffer_count);
         ^
368.     s->internal_buffer_count--;
369.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:368:5: 
366.     }
367.     assert(i < s->internal_buffer_count);
368.     s->internal_buffer_count--;
         ^
369.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
370. 

libavcodec/utils.c:369:5: 
367.     assert(i < s->internal_buffer_count);
368.     s->internal_buffer_count--;
369.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
370. 
371.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:371:5: 
369.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
370. 
371.     FFSWAP(InternalBuffer, *buf, *last);
         ^
372. 
373.     for(i=0; i<4; i++){
