block: Rename bdrv_set_locked() to bdrv_lock_medium()

While there, make the locked parameter bool.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index afb27c6..06778f3 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -833,7 +833,7 @@
 static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)
 {
     s->tray_locked = buf[4] & 1;
-    bdrv_set_locked(s->bs, buf[4] & 1);
+    bdrv_lock_medium(s->bs, buf[4] & 1);
     ide_atapi_cmd_ok(s);
 }