Fix warning excess elements in struct initializer
    
    src/main.c: In function 'main':
    src/main.c:80:75: warning: excess elements in struct initializer
       {"fork", 'f', POPT_ARG_NONE, NULL, 'f', N_("do become a daemon"), NULL, NULL},
                                                                               ^~~~
    src/main.c:80:75: note: (near initialization for 'popts[6]')
    
    Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>