fix: fskv的修改导致idf5编译失败

components/fskv/luat_fskv.c

@@ -81,7 +81,7 @@ int luat_fskv_stat(size_t *using_sz, size_t *total, size_t *kv_count) {
     return 0;
 }
 
-int luat_fskv_size(const char* key, uint8_t buff[4]) {
+int luat_fskv_size(const char* key, char buff[4]) {
     lfs_file_t fd = {0};
     int ret = 0;
     ret = lfs_file_open(&sfd_lfs->lfs, &fd, key, LFS_O_RDONLY);

components/fskv/luat_fskv.h

@@ -54,7 +54,7 @@ int luat_fskv_del(const char* key);
  */
 int luat_fskv_set(const char* key, void* data, size_t len);
 
-int luat_fskv_size(const char* key, uint8_t buff[4]);
+int luat_fskv_size(const char* key, char buff[4]);
 
 /**
  * @brief 读取指定key的数据