perf tools: No need to test against NULL before calling free()

Its perfectly fine to call free(NULL), so no need to clutter the source
code with all those superfluous testing.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uux5wpvevlerd42gqer13e7n@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -1158,9 +1158,7 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 	if (kvm->timerfd >= 0)
 		close(kvm->timerfd);
 
-	if (pollfds)
 	free(pollfds);
-
 	return err;
 }
 

tools/perf/ui/browsers/scripts.c

@@ -173,7 +173,6 @@ int script_browse(const char *script_opt)
 	if (script.b.width > AVERAGE_LINE_LEN)
 		script.b.width = AVERAGE_LINE_LEN;
 
-	if (line)
 	free(line);
 	pclose(fp);
 

tools/perf/util/header.c

@@ -1232,9 +1232,7 @@ static void free_event_desc(struct perf_evsel *events)
 		return;
 
 	for (evsel = events; evsel->attr.size; evsel++) {
-		if (evsel->name)
 		free(evsel->name);
-		if (evsel->id)
 		free(evsel->id);
 	}
 

tools/perf/util/probe-event.c

@@ -401,9 +401,7 @@ static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
 		}
 	}
 
-	if (tmp)
 	free(tmp);
-
 	return ret;
 }
 
@@ -1382,7 +1380,6 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 error:
 	pr_debug("Failed to synthesize perf probe point: %s\n",
 		 strerror(-ret));
-	if (buf)
 	free(buf);
 	return NULL;
 }
@@ -1584,33 +1581,24 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
 	struct perf_probe_arg_field *field, *next;
 	int i;
 
-	if (pev->event)
 	free(pev->event);
-	if (pev->group)
 	free(pev->group);
-	if (pp->file)
 	free(pp->file);
-	if (pp->function)
 	free(pp->function);
-	if (pp->lazy_line)
 	free(pp->lazy_line);
+
 	for (i = 0; i < pev->nargs; i++) {
-		if (pev->args[i].name)
 		free(pev->args[i].name);
-		if (pev->args[i].var)
 		free(pev->args[i].var);
-		if (pev->args[i].type)
 		free(pev->args[i].type);
 		field = pev->args[i].field;
 		while (field) {
 			next = field->next;
-			if (field->name)
 			free(field->name);
 			free(field);
 			field = next;
 		}
 	}
-	if (pev->args)
 	free(pev->args);
 	memset(pev, 0, sizeof(*pev));
 }
@@ -1620,20 +1608,13 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
 	struct probe_trace_arg_ref *ref, *next;
 	int i;
 
-	if (tev->event)
 	free(tev->event);
-	if (tev->group)
 	free(tev->group);
-	if (tev->point.symbol)
 	free(tev->point.symbol);
-	if (tev->point.module)
 	free(tev->point.module);
 	for (i = 0; i < tev->nargs; i++) {
-		if (tev->args[i].name)
 		free(tev->args[i].name);
-		if (tev->args[i].value)
 		free(tev->args[i].value);
-		if (tev->args[i].type)
 		free(tev->args[i].type);
 		ref = tev->args[i].ref;
 		while (ref) {
@@ -1642,7 +1623,6 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
 			ref = next;
 		}
 	}
-	if (tev->args)
 	free(tev->args);
 	memset(tev, 0, sizeof(*tev));
 }

tools/perf/util/probe-finder.c

@@ -1414,9 +1414,7 @@ int debuginfo__find_available_vars_at(struct debuginfo *dbg,
 	if (ret < 0) {
 		/* Free vlist for error */
 		while (af.nvls--) {
-			if (af.vls[af.nvls].point.symbol)
 			free(af.vls[af.nvls].point.symbol);
-			if (af.vls[af.nvls].vars)
 			strlist__delete(af.vls[af.nvls].vars);
 		}
 		free(af.vls);
@@ -1524,10 +1522,8 @@ int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
 	if (fname) {
 		ppt->file = strdup(fname);
 		if (ppt->file == NULL) {
-			if (ppt->function) {
 			free(ppt->function);
 			ppt->function = NULL;
-			}
 			ret = -ENOMEM;
 			goto end;
 		}

tools/perf/util/scripting-engines/trace-event-perl.c

@@ -194,7 +194,6 @@ static void define_event_symbols(struct event_format *event,
 		zero_flag_atom = 0;
 		break;
 	case PRINT_FIELD:
-		if (cur_field_name)
 		free(cur_field_name);
 		cur_field_name = strdup(args->field.name);
 		break;

tools/perf/util/scripting-engines/trace-event-python.c

@@ -161,7 +161,6 @@ static void define_event_symbols(struct event_format *event,
 		zero_flag_atom = 0;
 		break;
 	case PRINT_FIELD:
-		if (cur_field_name)
 		free(cur_field_name);
 		cur_field_name = strdup(args->field.name);
 		break;