core/cpu: Fix memory allocation for job array

fixes: 7a3f307 core/cpu: parallelise global CPU register setting jobs

This bug would result in boot-hang on some configurations due to
cpu_wait_job() endlessly waiting for the last bogus jobs[cpu->pir] pointer.

Reported-by: Stephanie Swanson <swanman@us.ibm.com>
Reported-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Reviewed-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

core/cpu.c

@@ -1373,7 +1373,7 @@ static int64_t cpu_change_all_hid0(struct hid0_change_req *req)
 	struct cpu_thread *cpu;
 	struct cpu_job **jobs;
 
-	jobs = zalloc(sizeof(struct cpu_job *) * cpu_max_pir + 1);
+	jobs = zalloc(sizeof(struct cpu_job *) * (cpu_max_pir + 1));
 	assert(jobs);
 
 	for_each_available_cpu(cpu) {
@@ -1424,7 +1424,7 @@ static int64_t cpu_cleanup_all(void)
 	struct cpu_thread *cpu;
 	struct cpu_job **jobs;
 
-	jobs = zalloc(sizeof(struct cpu_job *) * cpu_max_pir + 1);
+	jobs = zalloc(sizeof(struct cpu_job *) * (cpu_max_pir + 1));
 	assert(jobs);
 
 	for_each_available_cpu(cpu) {