bootutil: remove unused function prototype

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/boot/bootutil/src/bootutil_priv.h b/boot/bootutil/src/bootutil_priv.h
index e701429..24fe7e9 100644
--- a/boot/bootutil/src/bootutil_priv.h
+++ b/boot/bootutil/src/bootutil_priv.h
@@ -239,7 +239,6 @@
                                struct boot_swap_state *state);
 int boot_write_magic(const struct flash_area *fap);
 int boot_write_status(struct boot_loader_state *state, struct boot_status *bs);
-int boot_schedule_test_swap(void);
 int boot_write_copy_done(const struct flash_area *fap);
 int boot_write_image_ok(const struct flash_area *fap);
 int boot_write_swap_info(const struct flash_area *fap, uint8_t swap_type,