/work/agl-service-steering-wheel/src/steering_wheel_json.c:151:27: warning: conversion to ‘size_t {aka long unsigned int}’ from ‘__off_t {aka long int}’ may change the sign of the result [-Wsign-conversion]
 filebuf = (char *)malloc(stbuf.st_size);
 ^~~~~
 /work/agl-service-steering-wheel/src/steering_wheel_json.c:152:20: warning: conversion to ‘size_t {aka long unsigned int}’ from ‘__off_t {aka long int}’ may change the sign of the result [-Wsign-conversion]
 fread(filebuf, 1, stbuf.st_size, fp);
 ^~~~~
 /work/agl-service-steering-wheel/src/steering_wheel_json.c: In function ‘wheel_gear_para_init’:
 /work/agl-service-steering-wheel/src/steering_wheel_json.c:277:26: warning: conversion to ‘size_t {aka long unsigned int}’ from ‘__off_t {aka long int}’ may change the sign of the result [-Wsign-conversion]
 filebuf = (char*)malloc(stbuf.st_size);
 ^~~~~
 /work/agl-service-steering-wheel/src/steering_wheel_json.c:278:20: warning: conversion to ‘size_t {aka long unsigned int}’ from ‘__off_t {aka long int}’ may change the sign of the result [-Wsign-conversion]
 fread(filebuf, 1, stbuf.st_size, fp);