Fix build for multi-image using encrypted images

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/boot/bootutil/src/loader.c b/boot/bootutil/src/loader.c
index 5d6204f..95bf878 100644
--- a/boot/bootutil/src/loader.c
+++ b/boot/bootutil/src/loader.c
@@ -2330,7 +2330,7 @@
          * another images). Therefore, mark them as invalid to force their reload
          * by boot_enc_load().
          */
-        boot_enc_mark_keys_invalid();
+        boot_enc_mark_keys_invalid(state->enc);
 #endif /* MCUBOOT_ENC_IMAGES */
 
         /* Indicate that swap is not aborted */