ci: More verbose output from asan

Found by asan in ci.

.gitlab-ci/run-tests.sh

@@ -8,7 +8,7 @@ builddir=$1
 backend=$2
 
 # Ignore memory leaks lower in dependencies
-export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp:print_suppressions=0
+export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp:print_suppressions=0:verbosity=1:log_threads=1
 export G_SLICE=always-malloc
 
 case "${backend}" in

gdk/loaders/gdkjpeg.c

@@ -307,6 +307,7 @@ gdk_save_jpeg (GdkTexture *texture)
   g_object_unref (memtex);
   g_free (input);
   jpeg_destroy_compress (&info);
+  free (data);
 
   return g_bytes_new_with_free_func (data, size, (GDestroyNotify) free, NULL);
 }