dump.f2fs: remove unavailable option -g

Option "-g" for dump.f2fs is unavailable and not used in dump.f2fs.

Signed-off-by: Sheng Yong <shengyong@oppo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed