libavcodec/utils.c:342: error: Null Dereference
  pointer `buf` last assigned on line 332 could be null and is dereferenced at line 342, column 5.

libavcodec/utils.c:325:1: start of procedure avcodec_default_release_buffer()
323. }
324. 
325. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
326.     int i;
327.     InternalBuffer *buf, *last;

libavcodec/utils.c:329:5: 
327.     InternalBuffer *buf, *last;
328. 
329.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
330.     assert(s->internal_buffer_count);
331. 

libavcodec/utils.c:330:5: 
328. 
329.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
330.     assert(s->internal_buffer_count);
         ^
331. 
332.     buf = NULL; /* avoids warning */

libavcodec/utils.c:332:5: 
330.     assert(s->internal_buffer_count);
331. 
332.     buf = NULL; /* avoids warning */
         ^
333.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
334.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:333:9: 
331. 
332.     buf = NULL; /* avoids warning */
333.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
334.         buf= &((InternalBuffer*)s->internal_buffer)[i];
335.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:333:14: Loop condition is false. Leaving loop
331. 
332.     buf = NULL; /* avoids warning */
333.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
334.         buf= &((InternalBuffer*)s->internal_buffer)[i];
335.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:338:5: 
336.             break;
337.     }
338.     assert(i < s->internal_buffer_count);
         ^
339.     s->internal_buffer_count--;
340.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:339:5: 
337.     }
338.     assert(i < s->internal_buffer_count);
339.     s->internal_buffer_count--;
         ^
340.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
341. 

libavcodec/utils.c:340:5: 
338.     assert(i < s->internal_buffer_count);
339.     s->internal_buffer_count--;
340.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
341. 
342.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:342:5: 
340.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
341. 
342.     FFSWAP(InternalBuffer, *buf, *last);
         ^
343. 
344.     for(i=0; i<4; i++){
