hwmon: (pmbus/max20730) delete some dead code

The debugfs_create_dir() function never returns NULL.  Normal users are
not supposed to check the return value so the correct fix is just to
delete this check.

In the case where the debugfs_create_dir() fails, the function returns
NULL.  The other debugfs function check for NULL directory and handle
it.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20201022070659.GA2817762@mwandaSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/max20730.c

@@ -328,8 +328,6 @@ static int max20730_init_debugfs(struct i2c_client *client,
 		return -ENOENT;
 
 	max20730_dir = debugfs_create_dir(client->name, debugfs);
-	if (!max20730_dir)
-		return -ENOENT;
 
 	for (i = 0; i < MAX20730_DEBUGFS_NUM_ENTRIES; ++i)
 		psu->debugfs_entries[i] = i;