Fix GPG key decoding

Change-Id: I4332f624a80096fabad7b73fa55f9f6255dfcf61
diff --git a/jjb/onos/onos-release-build.sh b/jjb/onos/onos-release-build.sh
index de8de50..c45a20d 100644
--- a/jjb/onos/onos-release-build.sh
+++ b/jjb/onos/onos-release-build.sh
@@ -4,11 +4,11 @@
 ONOS_ROOT=`pwd`
 . tools/build/envDefaults
 
-# extract PGP key
-base64 -i secring.gpg.b64 >secring.gpg.b64
+# extract GPG key
+base64 -d secring.gpg.b64 >secring.gpg
 
 env
-
+ 
 # set up release build credentials
 . onos-build-credentials