find_thread() now returns B_NAME_NOT_FOUND when it doesn't find the thread

as stated in the BeBook - this fixes bug #458 as Tracker directly compared
with that error code.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17144 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/thread.c

@@ -1776,7 +1776,7 @@ find_thread(const char *name)
 	RELEASE_THREAD_LOCK();
 	restore_interrupts(state);
 
-	return B_ENTRY_NOT_FOUND;
+	return B_NAME_NOT_FOUND;
 }