Staging: sep: untangle the register_fs code

While goto can be useful for cleaner cleaning up in C (as Linux sometimes
does and I think Linus borrowed stylistically from Amiga) you can overdo it.
Here is a fine fine example of when it's overkill

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>