powerpc/pseries: fix potential memory leak in init_cpu_associativity()

If the vcpu_associativity alloc memory successfully but the
pcpu_associativity fails to alloc memory, the vcpu_associativity
memory leaks.

Fixes: d62c8dee ("powerpc/pseries: Provide vcpu dispatch statistics")
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Reviewed-by: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/1671003983-10794-1-git-send-email-wangyufen@huawei.com

arch/powerpc/platforms/pseries/lpar.c

@@ -526,8 +526,10 @@ static ssize_t vcpudispatch_stats_write(struct file *file, const char __user *p,
 
 	if (cmd) {
 		rc = init_cpu_associativity();
-		if (rc)
+		if (rc) {
+			destroy_cpu_associativity();
 			goto out;
+		}
 
 		for_each_possible_cpu(cpu) {
 			disp = per_cpu_ptr(&vcpu_disp_data, cpu);