ui-clone.c: Fix path check

The starts_with() check was broken in two ways: For one thing, the
parameters were passed in the wrong order, for another thing,
starts_with() returns 1 if the string starts with the prefix (not 0).

Note that this bug existed since commit 02a545e (Add support for cloning
over http, 2008-08-06) but only pops in in corner cases.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>

ui-clone.c

@@ -63,8 +63,8 @@ static void send_file(char *path)
 	}
 	ctx.page.mimetype = "application/octet-stream";
 	ctx.page.filename = path;
-	if (!starts_with(ctx.repo->path, path))
-		ctx.page.filename += strlen(ctx.repo->path) + 1;
+	skip_prefix(path, ctx.repo->path, &ctx.page.filename);
+	skip_prefix(ctx.page.filename, "/", &ctx.page.filename);
 	cgit_print_http_headers();
 	html_include(path);
 }