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: d62c8de ("powerpc/pseries: Provide vcpu dispatch statistics")
Signed-off-by: Wang Yufen <[email protected]>
Reviewed-by: "Naveen N. Rao" <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/[email protected]

Author: wangyufen316

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);