MAKE: plug memory leak

[Marc Espie]

If we look at job_handle_status, we see there's one case where it
doesn't place the job on the errorJob list, but doesn't try to reclaim
the memory.

Index: job.c
===================================================================
RCS file: /cvs/src/usr.bin/make/job.c,v
retrieving revision 1.143
diff -u -p -r1.143 job.c
--- job.c       30 Dec 2019 11:01:16 -0000      1.143
+++ job.c       31 Dec 2019 11:46:57 -0000
@@ -543,7 +544,8 @@ postprocess_job(Job *job)
                job->node->built_status = REBUILT;
                Make_Update(job->node);
                free(job);
-       }
+       } else if (job->exit_type != JOB_EXIT_OKAY && keepgoing)
+               free(job);
 
        if (errorJobs != NULL && !keepgoing &&
            aborting != ABORT_INTERRUPT)