[IrDA]: Fix IrDA build failure

When having built-in IrDA, we hit the following error:

`irda_sysctl_unregister' referenced in section `.init.text' of
net/built-in.o: defined in discarded section `.exit.text' of
net/built-in.o
`irda_proc_unregister' referenced in section `.init.text' of
net/built-in.o: defined in discarded section `.exit.text' of
net/built-in.o
`irsock_cleanup' referenced in section `.init.text' of net/built-in.o:
defined in discarded section `.exit.text' of net/built-in.o
`irttp_cleanup' referenced in section `.init.text' of net/built-in.o:
defined in discarded section `.exit.text' of net/built-in.o
`iriap_cleanup' referenced in section `.init.text' of net/built-in.o:
defined in discarded section `.exit.text' of net/built-in.o
`irda_device_cleanup' referenced in section `.init.text' of
net/built-in.o: defined in discarded section `.exit.text' of
net/built-in.o
`irlap_cleanup' referenced in section `.init.text' of net/built-in.o:
defined in discarded section `.exit.text' of net/built-in.o
`irlmp_cleanup' referenced in section `.init.text' of net/built-in.o:
defined in discarded section `.exit.text' of net/built-in.o
make[1]: *** [.tmp_vmlinux1] Error 1
make: *** [_all] Error 2

This is due to the irda_init fix recently added, where we call __exit
routines from an __init one. It is a build failure that I didn't catch
because it doesn't show up when building IrDA as a module. My apologies
for that.
The following patch fixes that failure and is against your net-2.6
tree. I hope it can make it to the merge window, and stable@kernel.org
is CCed on this mail.

Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>