[gnome-photos/wip/rishi/gesture-zoom: 3/10] image-view: Be more strict about what is acceptable

[Debarshi Ray <debarshir src gnome org>]

commit 3d63ba23e778d79ca8be20d190b5eb1fd96cd89d
Author: Debarshi Ray <debarshir gnome org>
Date:   Sun Oct 15 22:48:01 2017 +0200

    image-view: Be more strict about what is acceptable

 src/photos-image-view.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-image-view.c b/src/photos-image-view.c
index 04f7612..7a2a684 100644
--- a/src/photos-image-view.c
+++ b/src/photos-image-view.c
@@ -1050,6 +1050,7 @@ void
 photos_image_view_set_zoom (PhotosImageView *self, gdouble zoom)
 {
   g_return_if_fail (PHOTOS_IS_IMAGE_VIEW (self));
+  g_return_if_fail (zoom > 0.0);
 
   if (photos_utils_equal_double (self->zoom, zoom))
     return;