comment for fio_get_crc32(missing_ok) in backup_non_data_file

Author: funny-falcon

src/data.c

@@ -801,7 +801,10 @@ backup_non_data_file(pgFile *file, pgFile *prev_file,
 		(prev_file && file->exists_in_prev &&
 		 file->mtime <= parent_backup_time))
 	{
-
+		/*
+		 * file could be deleted under our feets.
+		 * But then backup_non_data_file_internal will handle it safely
+		 */
 		file->crc = fio_get_crc32(from_fullpath, FIO_DB_HOST, false, true);
 
 		/* ...and checksum is the same... */