Crash append_line()

[michaelortmann]

free(): invalid next size (fast)
Aborted (core dumped)

#8  0x00006517dbd73fe1 in n_free (ptr=0x65180095f060, file=file@entry=0x6517dbd98e28 "dcc.c", line=line@entry=940) at mem.c:443
        i = <optimized out>
#9  0x00006517dbd64aaa in append_line (idx=idx@entry=5, line=line@entry=0x6517dbdb6320 <buf> "    Server queue is at 1% (4 msgs)\r\n") at dcc.c:940
        l = <optimized out>
        p = 0x65180095ecf0
        q = 0x651800921890
        c = 0x65180089c340
#10 0x00006517dbd683bc in out_dcc_general (idx=5, buf=<optimized out>, x=<optimized out>) at dcc.c:980
        p = <optimized out>
        y = 0x6517dbdb6320 <buf> "    Server queue is at 1% (4 msgs)\r\n"
#11 0x00006517dbd69463 in dprint (idx=idx@entry=5, buf=buf@entry=0x7ffe427f9590 "    Server queue is at 1% (4 msgs)\n", len=<optimized out>) at dccutil.c:211
No locals.
#12 0x00006517dbd695eb in dprintf_eggdrop (idx=idx@entry=5, format=format@entry=0x79cb0695cd1a "    %s %d%% (%d msgs)\n") at dccutil.c:172
        buf = "    Server queue is at 1% (4 msgs)\n\000ted for 00:00)\n\000rs)\n\000\372Z\210\304\357\201j\t", '\000' <repeats 15 times>, "\301\003\000\000\000\000\000\000 \226\177B\376\177\000\000\301\003\000\000\000\000\000\000`\263\226\000\030e\000\000\000\000\000\000\000\200\212\354\003\000\000\000\000\000\000\000\340\226\177B\376\177\000\000\277u)\006\313y\000\000З\177B\376\177\000\000o\220&\006\313y\000\000Л\177B\001\000\000\000\006\000\000\000\000\000\000\000f\000\000\000\000\000\000\000\004\000\000\000\000\000\000\000\300s?\006\313y\000\000\377\377"...

eggdrop/src/dcc.c

Line 940 in 028e756

nfree(p->msg);