Bug fix.

Don't test on something that belongs in an assert.
is_main_thread() doesn't even exist unless --type=Debug.

indra/newview/statemachine/aistatemachine.h

@@ -351,7 +351,7 @@ class AIStateMachine {
 	bool running(void) const { return mState == bs_run; }
 
 	//! Return true if it's safe to call abort.
-	bool abortable(void) const { return (mState == bs_run && (!mIdle || is_main_thread())) || mState == bs_initialize; }
+	bool abortable(void) const { return mState == bs_run || mState == bs_initialize; }
 
 	//! Return true if the derived class is running but idle.
 	bool waiting(void) const { return mState == bs_run && mIdle; }