Adapt antithread to new talloc locking, and fix so talloc destructor

works.

ccan/antithread/test/run-simple.c

@@ -20,8 +20,8 @@ int main(int argc, char *argv[])
 	assert(atp);
 	pid = talloc(at_pool_ctx(atp), int);
 	assert(pid);
-	ok1((char *)pid >= (char *)atp->pool
-	    && (char *)pid < (char *)atp->pool + atp->poolsize);
+	ok1((char *)pid >= (char *)atp->p->pool
+	    && (char *)pid < (char *)atp->p->pool + atp->p->poolsize);
 	at = at_run(atp, test, pid);
 	assert(at);
 

ccan/antithread/test/run-spawn.c

@@ -26,8 +26,8 @@ int main(int argc, char *argv[])
 	assert(atp);
 	pid = talloc(at_pool_ctx(atp), int);
 	assert(pid);
-	ok1((char *)pid >= (char *)atp->pool
-	    && (char *)pid < (char *)atp->pool + atp->poolsize);
+	ok1((char *)pid >= (char *)atp->p->pool
+	    && (char *)pid < (char *)atp->p->pool + atp->p->poolsize);
 
 	/* This is a failed spawn. */
 	at = at_spawn(atp, pid, bad_args);

ccan/antithread/test/run-tell_parent.c

@@ -21,8 +21,8 @@ int main(int argc, char *argv[])
 	assert(atp);
 	pid = talloc(at_pool_ctx(atp), int);
 	assert(pid);
-	ok1((char *)pid >= (char *)atp->pool
-	    && (char *)pid < (char *)atp->pool + atp->poolsize);
+	ok1((char *)pid >= (char *)atp->p->pool
+	    && (char *)pid < (char *)atp->p->pool + atp->p->poolsize);
 	at = at_run(atp, test, pid);
 	assert(at);