KVM: SVM: fix error return code in svm_create_vcpu()

Fix to return a negative error code from the error handling case
instead of 0 in function svm_create_vcpu(), as done elsewhere in this
function.

Fixes: f4c847a ("KVM: SVM: refactor msr permission bitmap allocation")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Message-Id: <20201117025426.167824-1-chenzhou10@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: Chen Zhou

arch/x86/kvm/svm/svm.c

@@ -1309,8 +1309,10 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu)
 		svm->avic_is_running = true;
 
 	svm->msrpm = svm_vcpu_alloc_msrpm();
-	if (!svm->msrpm)
+	if (!svm->msrpm) {
+		err = -ENOMEM;
 		goto error_free_vmcb_page;
+	}
 
 	svm_vcpu_init_msrpm(vcpu, svm->msrpm);