Description of problem:
We are running on RHEL8 a python3 script that collect logs with the python standard "logging" module TimedRotatingFileHandler. We have added, in a second moment, the possibility to avoid the logger to gather information, redirecting to the device "/dev/null" the output.
We know that using the module StreamHandler it would correctly redirect to the device "/dev/null", but as anticipated in title, we would expect from filehandlers to raise an exception if the filename is related to a device without change it to a file. 

Version-Release number of selected component (if applicable):
$ python3
Python 3.6.8 (default, Dec  5 2019, 15:45:45)
[GCC 8.3.1 20191121 (Red Hat 8.3.1-5)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.version
'3.6.8 (default, Dec  5 2019, 15:45:45) \n[GCC 8.3.1 20191121 (Red Hat 8.3.1-5)]'

How reproducible:

reporoducer.py:
------------------------8<------------------------8<------------------------
import logging
from logging.handlers import TimedRotatingFileHandler

def setup_logger(name, log_file_path, level=logging.INFO):
    """To setup as many loggers as you want"""
    logger = logging.getLogger(name)
    logger.setLevel(level)
    handler = TimedRotatingFileHandler(log_file_path, when="m", interval=1, backupCount=5)
    formatter = logging.Formatter('%(asctime)s %(message)s')
    handler.setFormatter(formatter)
    logger.addHandler(handler)
    return logger


logger_path = "/dev/null"
logger = setup_logger("logger", logger_path)
logger.info("")
------------------------8<------------------------8<------------------------

Steps to Reproduce:
# touch -t 09260100 /dev/null.2021-07-16
# stat /dev/null.2021-07-16
  File: '/dev/null.2021-07-16'
  Size: 10635           Blocks: 24         IO Block: 4096   regular file
Device: 5h/5d   Inode: 1794379367  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Context: unconfined_u:object_r:device_t:s0
Access: 2021-09-26 01:00:00.000000000 +0200
Modify: 2021-09-26 01:00:00.000000000 +0200
Change: 2021-09-27 14:50:14.050201303 +0200
 Birth: -
#
# python3 reproducer.py 
# ls -l /dev/null*
crw-rw-rw-. 1 root root  1, 3 Sep 27 14:35 /dev/null
-rw-r--r--. 1 root root 10635 Sep 27 14:51 /dev/null.2021-07-16
crw-rw-rw-. 1 root root  1, 3 Jul 16 20:53 /dev/null.2021-07-16.2021-07-16
-rw-r--r--. 1 root root 10635 Sep 26 01:00 /dev/null.2021-07-16.2021-09-26


Actual results:
# ls -l /dev/null*
crw-rw-rw-. 1 root root 1, 3 Oct 13  2020 /dev/null
# python3 reproducer.py 
# ls -l /dev/null*
-rw-r--r--. 1 root root  788 Sep 27 16:08 /dev/null

Expected results:
# ls -l /dev/null*
crw-rw-rw-. 1 root root 1, 3 Oct 13  2020 /dev/null
# python3 reproducer.py 
-- Exception xxx --
# ls -l /dev/null*
crw-rw-rw-. 1 root root 1, 3 Oct 13  2020 /dev/null