Remove nwfilter tech driver 'displayRuleInstance' callback

The 'displayRuleInstance' callback in the nwfilter tech driver
is never invoked, so can be deleted.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/nwfilter/nwfilter_ebiptables_driver.c

@@ -2781,17 +2781,6 @@ ebiptablesFreeRuleInstance(void *_inst)
 }
 
 
-static int
-ebiptablesDisplayRuleInstance(void *_inst)
-{
-    ebiptablesRuleInstPtr inst = (ebiptablesRuleInstPtr)_inst;
-    VIR_INFO("Command Template: '%s', Needed protocol: '%s'",
-             inst->commandTemplate,
-             inst->neededProtocolChain);
-    return 0;
-}
-
-
 /**
  * ebiptablesExecCLI:
  * @buf: pointer to virBuffer containing the string with the commands to
@@ -4105,7 +4094,6 @@ virNWFilterTechDriver ebiptables_driver = {
     .tearOldRules        = ebiptablesTearOldRules,
     .allTeardown         = ebiptablesAllTeardown,
     .freeRuleInstance    = ebiptablesFreeRuleInstance,
-    .displayRuleInstance = ebiptablesDisplayRuleInstance,
 
     .canApplyBasicRules  = ebiptablesCanApplyBasicRules,
     .applyBasicRules     = ebtablesApplyBasicRules,

src/nwfilter/nwfilter_tech_driver.h

@@ -62,8 +62,6 @@ typedef int (*virNWFilterRuleAllTeardown)(const char *ifname);
 
 typedef int (*virNWFilterRuleFreeInstanceData)(void * _inst);
 
-typedef int (*virNWFilterRuleDisplayInstanceData)(void *_inst);
-
 typedef int (*virNWFilterCanApplyBasicRules)(void);
 
 typedef int (*virNWFilterApplyBasicRules)(const char *ifname,
@@ -95,7 +93,6 @@ struct _virNWFilterTechDriver {
     virNWFilterRuleTeardownOldRules tearOldRules;
     virNWFilterRuleAllTeardown allTeardown;
     virNWFilterRuleFreeInstanceData freeRuleInstance;
-    virNWFilterRuleDisplayInstanceData displayRuleInstance;
 
     virNWFilterCanApplyBasicRules canApplyBasicRules;
     virNWFilterApplyBasicRules applyBasicRules;