Avoid a potential hang when --remove-*-files is active.

io.c

@@ -447,9 +447,14 @@ static void read_msg_fd(void)
  * this, sender-side deletions were mostly happening at the end. */
 void increment_active_files(int ndx, int itemizing, enum logcode code)
 {
-	/* TODO: tune these limits? */
-	while (active_filecnt >= (active_bytecnt >= 128*1024 ? 10 : 50)) {
+	while (1) {
+		/* TODO: tune these limits? */
+		int limit = active_bytecnt >= 128*1024 ? 10 : 50;
+		if (active_filecnt < limit)
+			break;
 		check_for_finished_files(itemizing, code, 0);
+		if (active_filecnt < limit)
+			break;
 		if (iobuf_out_cnt)
 			io_flush(NORMAL_FLUSH);
 		else