target: Don't poll until the target is examined.

The timer callback is started on target init, but it makes no sense to
poll until the target is fully setup.

Change-Id: I118201e125e39be3d0a920e3ef9a3f68a2035f39
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/2041
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/target/target.c

@@ -2379,6 +2379,10 @@ static int handle_target(void *priv)
 	for (struct target *target = all_targets;
 			is_jtag_poll_safe() && target;
 			target = target->next) {
+
+		if (!target_was_examined(target))
+			continue;
+
 		if (!target->tap->enabled)
 			continue;