Seg Fault in paramsubst()

[Felix Rosencrantz <f_rosencrantz@xxxxxxxxx>]

When using this in my completer I would sometimes get seg faults.  Below
is a stack trace from gdb.  I think this stack trace would only occur if there
were either no matches or just one.  Though it might just happen in one of
those situations.

>    local w p h r
>    w=${(q)words[CURRENT-1]}
>    p=$'\0'$w$'\0'
>    h=$'\0'${(pj:\0:)${(z)history[(R)*$w*]}}
>    r=( ${${(ps:\1:)h//$~p/$'\1'}%%$'\0'*} )
>    compadd -a r
>
-FR

#0  0x80b472e in paramsubst (l=0xbfffbe88, n=0xbfffbe70, str=0xbfffbc58, qt=0, 
    ssub=0) at subst.c:1836
#1  0x80af2ec in stringsubst (list=0xbfffbe88, node=0xbfffbe70, ssub=0, 
    asssub=0) at subst.c:130
#2  0x80aec7f in prefork (list=0xbfffbe88, flags=0) at subst.c:74
#3  0x80af82f in multsub (s=0xbfffc108, a=0xbfffc104, isarr=0xbfffc12c, 
    sep=0x0) at subst.c:282
#4  0x80b216d in paramsubst (l=0xbfffc3f0, n=0xbfffc3e0, str=0xbfffc1b8, qt=0, 
    ssub=4) at subst.c:1065
#5  0x80af2ec in stringsubst (list=0xbfffc3f0, node=0xbfffc3e0, ssub=4, 
    asssub=0) at subst.c:130
#6  0x80aec7f in prefork (list=0xbfffc3f0, flags=6) at subst.c:74
#7  0x8065b6e in addvars (state=0xbfffc4d0, pc=0x8139d5c, export=0)
    at exec.c:1516
#8  0x8063a5e in execsimple (state=0xbfffc4d0) at exec.c:753
#9  0x8063bc8 in execlist (state=0xbfffc4d0, dont_change_job=1, exiting=0)
    at exec.c:806
#10 0x80639c8 in execode (p=0x8139a68, dont_change_job=1, exiting=0)
    at exec.c:729
#11 0x806b388 in runshfunc (prog=0x8139a68, wrap=0x0, 
    name=0x40249b40 "_history_prev_word") at exec.c:3461
#12 0x401cd80f in comp_wrapper (prog=0x8139a68, w=0x0, 
    name=0x40249b40 "_history_prev_word") at complete.c:1271


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