Tracks: fix a small memory leak.

Spotted by Leak Sanitiser while I was testing the standalone solver.

1 files changed, 1 insertions, 0 deletions

diff --git a/tracks.c b/tracks.c
index c68cca9..4a7e9b0 100644
--- a/tracks.c
+++ b/tracks.c
@@ -706,6 +706,7 @@ strip_clues:
 
 done:
     sfree(positions);
+    sfree(nedges_previous_solve);
     free_game(scratch);
     return ret;
 }