[sr-dev] fixup crash

[Juha Heinanen]

i build sip proxy from latest master and got this kind of crash during
startup:

(gdb) where
#0  0x00297265 in ?? ()
#1  0x080961fd in fixup_free_pvar_all (param=0x297265, param_no=1)
    at mod_fix.c:307
#2  0x080bb035 in fix_actions (a=0x82d4de8) at route.c:956
#3  0x080d0f8b in fix_rval_expr (p=0x82d7608) at rvalue.c:3719
#4  0x080bb1b6 in fix_actions (a=0x82d1520) at route.c:750
#5  0x080bb635 in fix_actions (a=0x8274870) at route.c:754
#6  0x080bd869 in fix_rl (rt=0x82541f8) at route.c:2096
#7  0x080bd890 in fix_rls () at route.c:2112
#8  0x08092839 in main (argc=15, argv=0xbfd731b4) at main.c:2430

-- juha