Inc_backup: minor fix to correct function name (#6565)

In script a wrong function name write_datas() has been used. The correct
one is write_data().

Signed-off-by: meinaLi <[email protected]>

Author: meinaLi

libvirt/tests/src/incremental_backup/incremental_backup_pull_mode_tls.py

@@ -170,7 +170,7 @@ def pull_full_backup_to_file():
         test.log.info("SETUP_TEST: prepare the guest.")
         prepare_guest()
         if with_secret_uuid:
-            write_datas()
+            write_data()
         test.log.info("TEST_STEP: start the backup.")
         backup_options = prepare_backup_xml()
         backup_begin(backup_options)