Merge pull request #1255 from zgc/klever1988

在线升级脚本对x86增加disk变量，解决安装盘不是sda情况，默认还是sda

scripts/autoupdate-bash.sh

@@ -43,7 +43,7 @@ fi
 mv $board_id.img FriendlyWrt.img
 block_device='mmcblk0'
 [ ! -d /sys/block/$block_device ] && block_device='mmcblk1'
-[ $board_id = 'x86' ] && block_device='sda'
+[ $board_id = 'x86' ] && block_device=${disk:-sda}
 bs=`expr $(cat /sys/block/$block_device/size) \* 512`
 truncate -s $bs FriendlyWrt.img || ../truncate -s $bs FriendlyWrt.img
 echo ", +" | sfdisk -N 2 FriendlyWrt.img