examples/ssd-test.fio: bump size to 10G

1G is a bit too tiny for most devices today, bump it to 10G.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/examples/ssd-test.fio b/examples/ssd-test.fio
index c84cf50..2b6a590 100644
--- a/examples/ssd-test.fio
+++ b/examples/ssd-test.fio
@@ -14,7 +14,7 @@
 bs=4k
 ioengine=libaio
 iodepth=4
-size=1g
+size=10g
 direct=1
 runtime=60
 directory=/mount-point-of-ssd