char: rename CharDriverState Chardev

Pick a uniform chardev type name.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/qtest.c b/qtest.c
index bd9d417..1446719 100644
--- a/qtest.c
+++ b/qtest.c
@@ -670,7 +670,7 @@
 
 void qtest_init(const char *qtest_chrdev, const char *qtest_log, Error **errp)
 {
-    CharDriverState *chr;
+    Chardev *chr;
 
     chr = qemu_chr_new("qtest", qtest_chrdev);