[mutter] meta-launcher: don't call g_object_unref() on NULL

[Rui Matos <rtcm src gnome org>]

commit e7a88dc6b2eed37d513cf33396d6cf35e8a049cc
Author: Marek Chalupa <mchqwerty gmail com>
Date:   Tue Dec 15 17:47:12 2015 +0100

    meta-launcher: don't call g_object_unref() on NULL
    
    g_object_unref() was called no matter what we got for value
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760670

 src/backends/native/meta-launcher.c |   16 +++++++++-------
 1 files changed, 9 insertions(+), 7 deletions(-)
---
diff --git a/src/backends/native/meta-launcher.c b/src/backends/native/meta-launcher.c
index 34480cd..7cd338b 100644
--- a/src/backends/native/meta-launcher.c
+++ b/src/backends/native/meta-launcher.c
@@ -295,7 +295,7 @@ get_primary_gpu_path (const gchar *seat_name)
   if (!devices)
     goto out;
 
-  for (tmp = devices; tmp != NULL && path == NULL; tmp = tmp->next)
+  for (tmp = devices; tmp != NULL; tmp = tmp->next)
     {
       GUdevDevice *platform_device = NULL, *pci_device = NULL;
       GUdevDevice *dev = tmp->data;
@@ -325,13 +325,15 @@ get_primary_gpu_path (const gchar *seat_name)
         continue;
 
       platform_device = g_udev_device_get_parent_with_subsystem (dev, "platform", NULL);
-      pci_device = g_udev_device_get_parent_with_subsystem (dev, "pci", NULL);
-
       if (platform_device != NULL)
         {
           path = g_strdup (g_udev_device_get_device_file (dev));
+          g_object_unref (platform_device);
+          break;
         }
-      else if (pci_device != NULL)
+
+      pci_device = g_udev_device_get_parent_with_subsystem (dev, "pci", NULL);
+      if (pci_device != NULL)
         {
           /* get value of boot_vga attribute or 0 if the device has no boot_vga */
           boot_vga = g_udev_device_get_sysfs_attr_as_int (pci_device, "boot_vga");
@@ -339,11 +341,11 @@ get_primary_gpu_path (const gchar *seat_name)
             {
               /* found the boot_vga device */
               path = g_strdup (g_udev_device_get_device_file (dev));
+              break;
             }
-        }
 
-      g_object_unref (platform_device);
-      g_object_unref (pci_device);
+          g_object_unref (pci_device);
+        }
     }
 
   g_list_free_full (devices, g_object_unref);