mkfs.f2fs: skip extension name that is too long
mkfs.f2fs: skip extension name that is too long

The length of extension name has a limit of 8 bytes. If an extension
exceeds the limitation, it will not be added to the extension_list.

Change-Id: I67765b42ff81a0e33b10aae9efa640f772187e9d
Signed-off-by: Chao Yu <0cc5db7488e13b393f245aa6263acec5e92fdcc5@samsung.com>
Signed-off-by: Sheng Yong <ce77ec10379c6f281208b7b41f03fd701be51d81@huawei.com>
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamExodus/external_f2fs-tools,TeamExodus/external_f2fs-tools