libavcodec/eval.c:302: error: Null Dereference
  pointer `e` last assigned on line 301 could be null and is dereferenced at line 302, column 5.

libavcodec/eval.c:300:1: start of procedure new_eval_expr()
298. }
299. 
300. static AVEvalExpr * new_eval_expr(int type, int value, AVEvalExpr *p0, AVEvalExpr *p1){
     ^
301.     AVEvalExpr * e = av_mallocz(sizeof(AVEvalExpr));
302.     e->type     =type   ;

libavcodec/eval.c:301:5: 
299. 
300. static AVEvalExpr * new_eval_expr(int type, int value, AVEvalExpr *p0, AVEvalExpr *p1){
301.     AVEvalExpr * e = av_mallocz(sizeof(AVEvalExpr));
         ^
302.     e->type     =type   ;
303.     e->value    =value  ;

libavutil/mem.c:132:1: start of procedure av_mallocz()
  130. }
  131. 
  132. void *av_mallocz(unsigned int size)
       ^
  133. {
  134.     void *ptr = av_malloc(size);

libavutil/mem.c:134:5: 
  132. void *av_mallocz(unsigned int size)
  133. {
  134.     void *ptr = av_malloc(size);
           ^
  135.     if (ptr)
  136.         memset(ptr, 0, size);

libavutil/mem.c:42:1: start of procedure av_malloc()
    40.    linker will do it automatically */
    41. 
    42. void *av_malloc(unsigned int size)
        ^
    43. {
    44.     void *ptr;

libavutil/mem.c:50:8: Taking false branch
    48. 
    49.     /* let's disallow possible ambiguous cases */
    50.     if(size > (INT_MAX-16) )
               ^
    51.         return NULL;
    52. 

libavutil/mem.c:61:5: Skipping memalign(): method has no implementation
    59.     ((char*)ptr)[-1]= diff;
    60. #elif defined (HAVE_MEMALIGN)
    61.     ptr = memalign(16,size);
            ^
    62.     /* Why 64?
    63.        Indeed, we should align it:

libavutil/mem.c:91:5: 
    89.     ptr = malloc(size);
    90. #endif
    91.     return ptr;
            ^
    92. }
    93. 

libavutil/mem.c:92:1: return from a call to av_malloc
    90. #endif
    91.     return ptr;
    92. }
        ^
    93. 
    94. void *av_realloc(void *ptr, unsigned int size)

libavutil/mem.c:135:9: Taking false branch
  133. {
  134.     void *ptr = av_malloc(size);
  135.     if (ptr)
               ^
  136.         memset(ptr, 0, size);
  137.     return ptr;

libavutil/mem.c:137:5: 
  135.     if (ptr)
  136.         memset(ptr, 0, size);
  137.     return ptr;
           ^
  138. }
  139. 

libavutil/mem.c:138:1: return from a call to av_mallocz
  136.         memset(ptr, 0, size);
  137.     return ptr;
  138. }
       ^
  139. 
  140. char *av_strdup(const char *s)

libavcodec/eval.c:302:5: 
300. static AVEvalExpr * new_eval_expr(int type, int value, AVEvalExpr *p0, AVEvalExpr *p1){
301.     AVEvalExpr * e = av_mallocz(sizeof(AVEvalExpr));
302.     e->type     =type   ;
         ^
303.     e->value    =value  ;
304.     e->param[0] =p0     ;
