ext2: Remove unnecessary blank

Remove unnecessary blank when calling kmalloc_array().

Link: https://lore.kernel.org/r/20201010094335.39797-1-tian.xianting@h3c.com


Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
Signed-off-by: Jan Kara <jack@suse.cz>