bridge: Fix generation of dnsmasq's --dhcp-hostsfile option

I added a host definition to a network definition:

<network>
  <name>Lokal</name>
  <uuid>2074f379-b82c-423f-9ada-305d8088daaa</uuid>
  <bridge name='virbr1' stp='on' delay='0' />
  <ip address='192.168.180.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.180.128' end='192.168.180.254' />
      <host mac='23:74:00:03:42:02' name='somevm' ip='192.168.180.10' />
    </dhcp>
  </ip>
</network>

But due to the wrong if-statement the argument --dhcp-hostsfile doesn't get
added to the dnsmasq command. The patch below fixes it for me.

AUTHORS

@@ -142,6 +142,7 @@ Patches have also been contributed by:
   Josh Durgin          <joshd@hq.newdream.net>
   Roopa Prabhu         <roprabhu@cisco.com>
   Paweł Krześniak      <pawel.krzesniak@gmail.com>
+  Kay Schubert         <kayegypt@web.de>
 
   [....send patches to get your name here....]
 

src/network/bridge_driver.c

@@ -524,7 +524,7 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
             goto cleanup;
         }
 
-        if (networkSaveDnsmasqHostsfile(ipdef, dctx, false) < 0) {
+        if (networkSaveDnsmasqHostsfile(ipdef, dctx, false) == 0) {
             virCommandAddArgPair(cmd, "--dhcp-hostsfile",
                                  dctx->hostsfile->path);
         }