bcachefs: fix error checking in bch2_fs_alloc()

There is a typo here where it uses ";" instead of "?:". The result is
that bch2_fs_fs_io_direct_init() is called unconditionally and the errors
from it are not checked.

Fixes: 0060c68159fc ("bcachefs: Split up fs-io.[ch]")
Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Kent Overstreet <[e-mail]>
Reviewed-by: Brian Foster <[e-mail]>

fs/bcachefs/super.c

···
 	    bch2_fs_compress_init(c) ?:
 	    bch2_fs_ec_init(c) ?:
 	    bch2_fs_fsio_init(c) ?:
-	    bch2_fs_fs_io_buffered_init(c);
+	    bch2_fs_fs_io_buffered_init(c) ?:
 	    bch2_fs_fs_io_direct_init(c);
 	if (ret)
 		goto err;