Don't crash if exif_content_ref/unref is passed NULL.

The rest of the API functions already handle NULL values.

diff --git a/libexif/exif-content.c b/libexif/exif-content.c
index 6d6c589..5f39c1b 100644 (file)
--- a/libexif/exif-content.c
+++ b/libexif/exif-content.c
@@ -78,12 +78,18 @@ exif_content_new_mem (ExifMem *mem)
 void
 exif_content_ref (ExifContent *content)
 {
+       if (!content)
+               return;
+
        content->priv->ref_count++;
 }
 
 void
 exif_content_unref (ExifContent *content)
 {
+       if (!content)
+               return;
+
        content->priv->ref_count--;
        if (!content->priv->ref_count)
                exif_content_free (content);