libmakepkg: fix test bracket style

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/libmakepkg/lint_package/missing_backup.sh.in b/scripts/libmakepkg/lint_package/missing_backup.sh.in
index 64d5a64a..f2a230b6 100644
--- a/scripts/libmakepkg/lint_package/missing_backup.sh.in
+++ b/scripts/libmakepkg/lint_package/missing_backup.sh.in
@@ -18,7 +18,7 @@
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-[ -n "$LIBMAKEPKG_LINT_PACKAGE_MISSING_BACKUP_SH" ] && return
+[[ -n "$LIBMAKEPKG_LINT_PACKAGE_MISSING_BACKUP_SH" ]] && return
 LIBMAKEPKG_LINT_PACKAGE_MISSING_BACKUP_SH=1
 
 LIBRARY=${LIBRARY:-'@libmakepkgdir@'}