.travis.yml: Add missing $ to OSTree guard
I'd missed this in (.travis.yml: Only install OSTree on
Linux, 2018-03-08,  Without the $, OSTree was never being
compiled, even on Linux.
@@ -14,7 +14,7 @@ before_install:
install:
- make install.tools
- >
- if [ "{TRAVIS_OS_NAME}" = linux ]; then
+ if [ "${TRAVIS_OS_NAME}" = linux ]; then
OSTREE_VERSION=v2017.9;
git clone https://github.com/ostreedev/ostree ${TRAVIS_BUILD_DIR}/ostree &&
(
