Change variable check to match existing style

Signed-off-by: Tai Kedzierski <dch.tai@gmail.com>

diff --git a/templates/lxc-download.in b/templates/lxc-download.in
index c1a0638a2dd8762437ba3c5843347b6ad9d8b372..bc7811c68c4b67148c7dbbed0eed8509bd22df99 100644 (file)
--- a/templates/lxc-download.in
+++ b/templates/lxc-download.in
@@ -53,7 +53,7 @@ LXC_NAME=
 LXC_PATH=
 LXC_ROOTFS=
 
-if [ -z "${DOWNLOAD_KEYSERVER+x}" ]; then
+if [ -z "${DOWNLOAD_KEYSERVER:-}" ]; then
        DOWNLOAD_KEYSERVER="hkp://pool.sks-keyservers.net"
 
        # Deal with GPG over http proxy