scoutfs-tests: create dir in 0 mount

When running a test we only create the test dir through one mount, but
we were off-by-one when deciding that we were iterating through the
first mount.

Signed-off-by: Zach Brown <zab@versity.com>

tests/run-tests.sh

@@ -404,7 +404,7 @@ for t in $tests; do
 	for i in $(seq 0 $((T_NR_MOUNTS - 1))); do
 		dir="${T_M[$i]}/test/$test_name"
 
-		test $i == 1 && cmd mkdir -p "$dir"
+		test $i == 0 && cmd mkdir -p "$dir"
 
 		eval T_D$i=$dir
 		T_D[$i]=$dir