qemu_domain: Modify access to a NVMe disk iff needed

If a domain has a NVMe disk it already has the access configured.
Trying to configure it again on a commit or some other operation
is wrong and condemned to failure.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_domain.c

@@ -11676,13 +11676,12 @@ qemuDomainStorageSourceAccessModify(virQEMUDriverPtr driver,
 
     revoke_lockspace = true;
 
-    if (qemuDomainStorageSourceAccessModifyNVMe(driver, vm, src, false) < 0)
-        goto revoke;
+    if (!(flags & QEMU_DOMAIN_STORAGE_SOURCE_ACCESS_MODIFY_ACCESS)) {
+        if (qemuDomainStorageSourceAccessModifyNVMe(driver, vm, src, false) < 0)
+            goto revoke;
 
-    revoke_nvme = true;
+        revoke_nvme = true;
 
-    /* When modifying access of existing @src namespace does not need update */
-    if (!(flags & QEMU_DOMAIN_STORAGE_SOURCE_ACCESS_MODIFY_ACCESS)) {
         if (qemuDomainNamespaceSetupDisk(vm, src) < 0)
             goto revoke;