Bug#972411: /bin/ksh93: ksh: ksh93 -c 'kill %-4' crashes with segfault

[Thorsten Glaser]

>First reported by CrystalMath <~coderain@reactos/developer/theflash>

Here’s the patch they came up with and tested locally.
--- ksh-93u+20120801.orig/src/cmd/ksh93/sh/jobs.c
+++ ksh-93u+20120801/src/cmd/ksh93/sh/jobs.c
@@ -1111,7 +1111,7 @@ static struct process *job_bystring(regi
 
 int job_kill(register struct process *pw,register int sig)
 {
-       Shell_t *shp = pw->p_shp;
+       Shell_t *shp;
        register pid_t pid;
        register int r;
        const char *msg;
@@ -1125,6 +1125,7 @@ int job_kill(register struct process *pw
        if(pw==0)
                goto error;
        pid = pw->p_pid;
+       shp = pw->p_shp;
 #if SHOPT_COSHELL
        if(pw->p_cojob)
                r = cokill(pw->p_cojob->coshell,pw->p_cojob,sig);