Fix memory leak in fcc_move

This usually occurs when re-initializing a file credential
cache over the top of an existing one.

This was meant to be fixed in commit 48cb3aa by calling
fcc_destroy(), but that only unlinks the "from" file
(which was already renamed or unlinked) but still doesn't
free the in-memory credentials. Using fcc_close() instead of
fcc_destroy() frees the leaked in-memory credentials.

Signed-off-by: Love Hornquist Astrand <lha@h5l.org>

lib/krb5/fcache.c

@@ -968,7 +968,7 @@ fcc_move(krb5_context context, krb5_ccache from, krb5_ccache to)
 	close(fd);
     }
 
-    fcc_destroy(context, from);
+    fcc_close(context, from);
 
     return ret;
 }