srd_exit(): Fix a -Wcast-function-type compiler warning.

  srd.c: In function ‘srd_exit’:
  srd.c:310:28: warning: cast between incompatible function types from ‘int (*)(struct srd_session *)’ to ‘void (*)(void *, void *)’ [-Wcast-function-type]
    g_slist_foreach(sessions, (GFunc)srd_session_destroy, NULL);
                              ^

1 files changed, 2 insertions, 1 deletions

diff --git a/srd.c b/srd.c
index d4ec44b..5903c6d 100644
--- a/srd.c
+++ b/srd.c
@@ -307,7 +307,8 @@ SRD_API int srd_exit(void)
 {
 	srd_dbg("Exiting libsigrokdecode.");
 
-	g_slist_foreach(sessions, (GFunc)srd_session_destroy, NULL);
+	for (GSList *l = sessions; l; l = l->next)
+		srd_session_destroy(l->data);
 
 	srd_decoder_unload_all();
 	g_slist_free_full(searchpaths, g_free);