[sr-dev] nathelper compiler warning

[Juha Heinanen]

i was going to fix an issue with add_contact_alias() function, but got
this compiler warning in existing master version of the module:

CC (cc) [M nathelper.so]		nathelper.o
nathelper.c: In function ‘mod_init’:
nathelper.c:552: warning: implicit declaration of function ‘register_mi_mod’

it would be nice to get rid of it somehow.  i thing it has appeared
quite recently.

-- juha