fs/ntfs3: Redesign ntfs_create_inode to return error code instead of inode

As Al Viro correctly pointed out, there is no need to return
the whole structure to check the error.
https://lore.kernel.org/ntfs3/20240322023515.GK538574@ZenIV/

Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>