mxqd: Fix uninitialized warning

gcc shows "warning: ‘status’ may be used uninitialized in this function
[-Wmaybe-uninitialized]" on higher optimization levels.

The variable will not be unitialized, if the code logic and the kernel
process modell and system calls work as expected, but the compiler
doesn't know about that.

Initialize variable to a dont-care value to silence the compiler.

mxqd.c

@@ -1169,7 +1169,7 @@ static int is_reaper(pid_t pid) {
 int reaper_process(struct mxq_server *server,struct mxq_group_list *glist, struct mxq_job *job) {
     pid_t pid;
     struct rusage rusage;
-    int status;
+    int status = 0;
     pid_t  waited_pid;
     int    waited_status;
     struct timeval now;