qemuBuildCommandLine: Don't add tlsPort if none set

If user hasn't supplied any tlsPort we default to setting it
to zero in our internal structure. However, when building command
line we test it against -1 which is obviously wrong.

src/qemu/qemu_command.c

@@ -5375,7 +5375,7 @@ qemuBuildCommandLine(virConnectPtr conn,
 
         virBufferAsprintf(&opt, "port=%u", def->graphics[0]->data.spice.port);
 
-        if (def->graphics[0]->data.spice.tlsPort != -1) {
+        if (def->graphics[0]->data.spice.tlsPort) {
             if (!driver->spiceTLS) {
                 qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                 _("spice TLS port set in XML configuration,"

tests/qemuxml2argvdata/qemuxml2argv-graphics-spice-timeout.args

@@ -10,6 +10,6 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=spice \
 -device rtl8139,vlan=0,id=net0,mac=52:54:00:71:70:89,bus=pci.0,addr=0x7 \
 -net tap,script=/etc/qemu-ifup,vlan=0,name=hostnet0 -serial pty \
 -usb -device usb-tablet,id=input0 \
--spice port=5900,tls-port=0,x509-dir=/etc/pki/libvirt-spice -vga std \
+-spice port=5900,x509-dir=/etc/pki/libvirt-spice -vga std \
 -device AC97,id=sound0,bus=pci.0,addr=0x3 \
 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5