FROMLIST: f2fs: fix wrong check on F2FS_IOC_FSSETXATTR

This fixes the incorrect failure when enabling project quota on
casefold-enabled file.

Cc: Daniel Rosenberg <drosen@google.com>
Cc: kernel-team@android.com
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Link: https://lore.kernel.org/linux-f2fs-devel/20200307002440.GA7944@google.com/


Signed-off-by: Daniel Rosenberg <drosen@google.com>
Change-Id: Ib2f8db5e20aabf5a4e6e9ebbc071166e8bd3220f