dfaed15bf9
Sync some patchs from upstreaming and modifies are as follow: 1. The rte_kvargs_process() was used to parse KV pairs, it also supports to parse 'only keys' type. And the callback function parameter 'value' is NULL when parsed 'only keys'. This patch fixes segment fault when parse input args with 'only keys'. 2. The MAP_FAILED should be used to determine whether the mapping is successful but not NULL. This patch fix it.