fixed 7bb5353 from https://gitee.com/arvinzzz/kernel_liteos_m/pulls/717

fixed d837ed3 from https://gitee.com/arvinzzz/kernel_liteos_m/pulls/716
fix: ping命令内访问野指针及内存泄漏

Signed-off-by: arvinzzz <zhaotianyu9@huawei.com>

components/net/lwip-2.1/porting/src/api_shell.c

@@ -586,7 +586,6 @@ u32_t OsShellPing(int argc, const char **argv)
         stPingTask.uwArg = (UINTPTR)parg;
         ret = LOS_TaskCreate((UINT32 *)(&ping_taskid), &stPingTask);
         if (ret != LOS_OK) {
-            free(parg);
             PRINTK("ping_task create failed 0x%08x.\n", ret);
             count = LWIP_SHELL_CMD_PING_RETRY_TIMES;
         } else {
@@ -602,6 +601,8 @@ u32_t OsShellPing(int argc, const char **argv)
         PRINTK("Ping cmd failed due some errors\n");
     }
 
+    free(parg);
+
     return LOS_OK;
 ping_error:
     lwip_ping_usage();