test suite: t-defdistro: Set distro='' too

This means that t-defdistro works without t-chain-test and
reinvocation.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/lib b/tests/lib
index f4f9fc5..e7ab334 100644
--- a/tests/lib
+++ b/tests/lib
@@ -783,6 +783,7 @@ t-822-field () {
 
 t-defdistro () {
 	export DGIT_TEST_DISTRO=''
+	distro=''
 	t-git-config dgit-suite.unstable.distro test-dummy
 }