x86: KVM: svm: Fix a check in nested_svm_vmrun()

We refactored this code a bit and accidentally deleted the "-" character
from "-EINVAL".  The kvm_vcpu_map() function never returns positive
EINVAL.

Fixes: c8e16b78 ("x86: KVM: svm: eliminate hardcoded RIP advancement from vmrun_interception()")
Cc: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm.c

@@ -3598,7 +3598,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm)
 	vmcb_gpa = svm->vmcb->save.rax;
 
 	ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
-	if (ret == EINVAL) {
+	if (ret == -EINVAL) {
 		kvm_inject_gp(&svm->vcpu, 0);
 		return 1;
 	} else if (ret) {