In sys/vm/vm_pageout.c, since vm_pageout_worker() takes a void * as

argument, cast the incoming 0 argument to void *, to silence a warning
from clang 3.4 ("expression which evaluates to zero treated as a null
pointer constant of type 'void *' [-Wnon-literal-null-conversion]").

MFC after:	3 days

sys/vm/vm_pageout.c

@@ -1699,7 +1699,7 @@ vm_pageout(void)
 		}
 	}
 #endif
-	vm_pageout_worker((uintptr_t)0);
+	vm_pageout_worker((void *)(uintptr_t)0);
 }
 
 /*