Issue: https://bugs.gentoo.org/875413
Upstream issue: https://gitlab.gnome.org/GNOME/gimp/-/issues/8807
Upstream patch: https://gitlab.gnome.org/GNOME/gimp/-/commit/543f9e37e69b4e57b5e44092542c95bb2052f047

--- a/plug-ins/common/file-dicom.c
+++ b/plug-ins/common/file-dicom.c
@@ -602,7 +602,7 @@ load_image (const gchar  *filename,
                                (gchar *) value, samples_per_pixel);
                   g_free (dicominfo);
                   fclose (DICOM);
-                  return NULL;
+                  return -1;
                 }
 
               break;