util: remove currentBackend from virfirewall.c

Since the currentBackend (direct vs. firewalld) setting is no longer
used for anything, we don't need to set it (either explicitly from
tests, or implicitly during init), and can completely remove it.

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

tests/networkxml2firewalltest.c

@@ -31,9 +31,7 @@
 # include "network/bridge_driver_platform.h"
 # include "virbuffer.h"
 # include "virmock.h"
-
-# define LIBVIRT_VIRFIREWALLPRIV_H_ALLOW
-# include "virfirewallpriv.h"
+# include "virfirewall.h"
 
 # define LIBVIRT_VIRCOMMANDPRIV_H_ALLOW
 # include "vircommandpriv.h"
@@ -167,10 +165,6 @@ mymain(void)
             ret = -1; \
     } while (0)
 
-    if (virFirewallSetBackend(VIR_FIREWALL_BACKEND_DIRECT) < 0) {
-        return EXIT_FAILURE;
-    }
-
     basefile = g_strdup_printf("%s/networkxml2firewalldata/base.args", abs_srcdir);
 
     if (virFileReadAll(basefile, INT_MAX, &baseargs) < 0)