mutex: make 0/1 FIO_MUTEX_LOCKED and FIO_MUTEX_UNLOCKED

Makes the API look cleaner.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/smalloc.c b/smalloc.c
index 5ba2004..d0b6f1e 100644
--- a/smalloc.c
+++ b/smalloc.c
@@ -206,7 +206,7 @@
 	pool->map = ptr;
 	pool->bitmap = (void *) ptr + (pool->nr_blocks * SMALLOC_BPL);
 
-	pool->lock = fio_mutex_init(1);
+	pool->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 	if (!pool->lock)
 		goto out_fail;