qemu: qemuDomainNamespaceUnlinkPaths: Return 0 in case of success

Commit 7a931a42 refactored the code and probably forgot to add
this line.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>

src/qemu/qemu_domain.c

@@ -10212,7 +10212,7 @@ qemuDomainNamespaceUnlinkPaths(virDomainObjPtr vm,
             goto cleanup;
     }
 
-
+    ret = 0;
  cleanup:
     virStringListFreeCount(devMountsPath, ndevMountsPath);
     virObjectUnref(cfg);