vm_pager_put_pages() takes VM_PAGER_* flags, not OBJPC_* flags. It just

so happens that OBJPC_SYNC has the same value as VM_PAGER_PUT_SYNC so no
harm done.  But fix it :-)

No operational changes.

MFC after:	1 day

sys/vm/vm_pageout.c

@@ -392,7 +392,7 @@ vm_pageout_flush(mc, count, flags)
 	vm_object_pip_add(object, count);
 
 	vm_pager_put_pages(object, mc, count,
-	    (flags | ((object == kernel_object) ? OBJPC_SYNC : 0)),
+	    (flags | ((object == kernel_object) ? VM_PAGER_PUT_SYNC : 0)),
 	    pageout_status);
 
 	vm_page_lock_queues();