KVM: x86: fix error return code in kvm_arch_vcpu_init()

Fix to return a negative error code from the error handling
case instead of 0, as returned elsewhere in this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NGleb Natapov <gleb@redhat.com>

arch/x86/kvm/x86.c

@@ -6752,8 +6752,10 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	}
 	vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
 
-	if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
+	if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) {
+		r = -ENOMEM;
 		goto fail_free_mce_banks;
+	}
 
 	r = fx_init(vcpu);
 	if (r)