examples: don't lose `const`
diff --git a/examples/describe.c b/examples/describe.c
index 2d95312..0437ca1 100644
--- a/examples/describe.c
+++ b/examples/describe.c
@@ -54,7 +54,7 @@ static void opts_add_commit(describe_options *opts, const char *commit)
assert(opts != NULL);
sz = ++opts->commit_count * sizeof(opts->commits[0]);
- opts->commits = xrealloc(opts->commits, sz);
+ opts->commits = (const char **)xrealloc(opts->commits, sz);
opts->commits[opts->commit_count - 1] = commit;
}