[gnome-battery-bench] System info: make C89 compilers happy

[Christian Kellner <gicmo src gnome org>]

commit 00bf4cc832241e81f685eb2a831d555bf5f3f141
Author: Christian Kellner <gicmo gnome org>
Date:   Wed Jul 5 16:39:58 2017 +0200

    System info: make C89 compilers happy

 src/system-info.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/system-info.c b/src/system-info.c
index a1cdc38..9ee9713 100644
--- a/src/system-info.c
+++ b/src/system-info.c
@@ -291,7 +291,7 @@ static GPtrArray *
 gbb_pci_device_discover(GUdevClient *client, int code, int sub, int progif)
 {
     GPtrArray *devices = NULL;
-    GList *udevices;
+    GList *udevices, *l;
 
     if (client == NULL) {
         client = g_udev_client_new(NULL);
@@ -303,7 +303,7 @@ gbb_pci_device_discover(GUdevClient *client, int code, int sub, int progif)
 
     devices = g_ptr_array_new_with_free_func(g_object_unref);
 
-    for (GList *l = udevices; l; l = l->next) {
+    for (l = udevices; l; l = l->next) {
         GUdevDevice *udev_device = l->data;
         GbbPciDevice *dev;
         GbbPciClass cid;