perf session: Free environment information when deleting session

The perf session environment information was saved (so allocated) during
perf_session__open, but was not freed.  As free(3) handles NULL pointer
input properly it won't cause a issue for writing modes - e.g. perf
record

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1353472999-23042-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/session.c

@@ -204,11 +204,28 @@ static void perf_session__delete_threads(struct perf_session *session)
 	machine__delete_threads(&session->host_machine);
 }
 
+static void perf_session_env__delete(struct perf_session_env *env)
+{
+	free(env->hostname);
+	free(env->os_release);
+	free(env->version);
+	free(env->arch);
+	free(env->cpu_desc);
+	free(env->cpuid);
+
+	free(env->cmdline);
+	free(env->sibling_cores);
+	free(env->sibling_threads);
+	free(env->numa_nodes);
+	free(env->pmu_mappings);
+}
+
 void perf_session__delete(struct perf_session *self)
 {
 	perf_session__destroy_kernel_maps(self);
 	perf_session__delete_dead_threads(self);
 	perf_session__delete_threads(self);
+	perf_session_env__delete(&self->header.env);
 	machine__exit(&self->host_machine);
 	close(self->fd);
 	free(self);