image_signing: emit required_dmparams_regex in case of mismatch

BRANCH=none
TEST=none
BUG=none

Change-Id: Iece5272622467829050ca50a4842ef771addf7ae
Reviewed-on: https://chromium-review.googlesource.com/267739
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Amey Deshpande <ameyd@google.com>
Tested-by: Amey Deshpande <ameyd@google.com>
diff --git a/scripts/image_signing/ensure_secure_kernelparams.sh b/scripts/image_signing/ensure_secure_kernelparams.sh
index 2b13cff..a471a6f 100755
--- a/scripts/image_signing/ensure_secure_kernelparams.sh
+++ b/scripts/image_signing/ensure_secure_kernelparams.sh
@@ -153,7 +153,8 @@
     if [ $testfail -eq 1 ]; then
         echo "Kernel dm= parameter does not match any expected values!"
         echo "Actual:   $dmparams"
-        echo "Expected: ${required_dmparams[@]}"
+        echo "Expected: ${required_dmparams[*]}"
+        echo "Expected (regex): ${required_dmparams_regex[*]}"
     fi
 
     # Ensure all other required params are present.