This is a simple bug.  target_disable_btrace and target_teardown_btrace,
both from gdb/target.c, do a "return" calling another function.  But both
are marked as void.  Despite the fact that the functions being called are
void as well, this is wrong.  This patch fixes this by calling the functions
and then returning in the next line.

2013-10-16  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR gdb/16042
	* target.c (target_disable_btrace): Fix invalid return value for
	void function.
	(target_teardown_btrace): Likewise.