filesys: Check for null from close_fn

If the filesystem type name isn't known it can return a NULL.

1 files changed, 2 insertions, 1 deletions

diff --git a/libparted/fs/r/filesys.c b/libparted/fs/r/filesys.c
index 9dafd71..6e795bc 100644
--- a/libparted/fs/r/filesys.c
+++ b/libparted/fs/r/filesys.c
@@ -198,8 +198,9 @@ ped_file_system_close (PedFileSystem* fs)
 {
        PED_ASSERT (fs != NULL);
        PedDevice *dev = fs->geom->dev;
+       close_fn_t fn = close_fn (fs->type->name);
 
-       if (!(close_fn (fs->type->name) (fs)))
+       if (!fn || !(fn (fs)))
                goto error_close_dev;
        ped_device_close (dev);
        return 1;