create_job() may return NULL

[Ricardo Jose Maraschini]

Hya,

Function create_job() may return NULL in case of memory
allocation problems, so i think its valid to verify if 
job is valid on wproc_run_job().

-rm

===================================================================
--- base/workers.c	(revision 2479)
+++ base/workers.c	(working copy)
@@ -869,6 +869,9 @@
 	worker_process *wp;
 	int ret;
 
+	if (!job)
+		return ERROR;
+
 	/*
 	 * get_worker() also adds job to the workers list
 	 * and sets job_id



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