windows: Rename free_windows to windows_free

Change-Id: Ifd9edb499069b6b7df48155aa2c8e955426751a5
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd.c b/mboxd.c
index 0baa1ce..ccdccc1 100644
--- a/mboxd.c
+++ b/mboxd.c
@@ -407,7 +407,7 @@
 	flash_dev_free(context);
 	lpc_dev_free(context);
 	free_mbox_dev(context);
-	free_windows(context);
+	windows_free(context);
 #ifdef VIRTUAL_PNOR_ENABLED
 	destroy_vpnor(context);
 #endif