tests/create-tarball-with-tmp-mounted-nodev: increase tmpfs size

tests/create-tarball-with-tmp-mounted-nodev

@@ -5,7 +5,7 @@ if [ ! -e /mmdebstrap-testenv ]; then
 	echo "this test modifies the system and should only be run inside a container" >&2
 	exit 1
 fi
-mount -t tmpfs -o nodev,nosuid,size=300M tmpfs /tmp
+mount -t tmpfs -o nodev,nosuid,size=400M tmpfs /tmp
 # use --customize-hook to exercise the mounting/unmounting code of block devices in root mode
 {{ CMD }} --mode=root --variant=apt --customize-hook='mount | grep /dev/full' --customize-hook='test "$(echo foo | tee /dev/full 2>&1 1>/dev/null)" = "tee: /dev/full: No space left on device"' {{ DIST }} /tmp/debian-chroot.tar {{ MIRROR }}
 tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -