bitbake: lib: amend code to use proper singleton comparisons where possible

amend the code to handle singleton comparisons properly so it only checks
if they only refer to the same object or not, and not bother
comparing the values.

(Bitbake rev: b809a6812aa15a8a9af97bc382cc4b19571e6bfc)

Signed-off-by: Frazer Clews <frazer.clews@codethink.co.uk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/pyinotify.py

@@ -1274,7 +1274,7 @@ class Notifier:
             basename = os.path.basename(sys.argv[0]) or 'pyinotify'
             pid_file = os.path.join(dirname, basename + '.pid')
 
-        if pid_file != False and os.path.lexists(pid_file):
+        if pid_file and os.path.lexists(pid_file):
             err = 'Cannot daemonize: pid file %s already exists.' % pid_file
             raise NotifierError(err)
 
@@ -1308,7 +1308,7 @@ class Notifier:
         fork_daemon()
 
         # Write pid
-        if pid_file != False:
+        if pid_file:
             flags = os.O_WRONLY|os.O_CREAT|os.O_NOFOLLOW|os.O_EXCL
             fd_pid = os.open(pid_file, flags, 0o0600)
             os.write(fd_pid,  bytes(str(os.getpid()) + '\n',