[NETFILTER]: nf_conntrack_h323: clean up code a bit

-total: 81 errors, 3 warnings, 876 lines checked
+total: 44 errors, 3 warnings, 876 lines checked

There is still work to be done, but that's for another patch.
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>