boot: superfluous assignment in bootflow_menu_new()

ret is assigned a value 0 which is never used but
is immediately overwritten in the next statement.

Addresses-Coverity-ID: 453304 ("Unused value")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/boot/bootflow_menu.c b/boot/bootflow_menu.c
index 7c1abe5..16f9cd8 100644
--- a/boot/bootflow_menu.c
+++ b/boot/bootflow_menu.c
@@ -120,7 +120,6 @@
 
 		if (ret < 0)
 			return log_msg_ret("itm", -EINVAL);
-		ret = 0;
 		priv->num_bootflows++;
 	}