regulator: dbx500: Remove unused debugfs goto label

The following build warning is seen after commit 8bdaa438 ("regulator:
dbx500: no need to check return value of debugfs_create functions"):

drivers/regulator/dbx500-prcmu.c:144:1: warning: label 'exit_no_debugfs' defined but not used [-Wunused-label]

Remove the unused label and its associated error message.

Fixes: 8bdaa438 ("regulator: dbx500: no need to check return value of debugfs_create functions")
Reported-by: Olof's autobuilder <build@lixom.net>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20200821144823.13404-1-festevam@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/dbx500-prcmu.c

@@ -141,8 +141,6 @@ ux500_regulator_debug_init(struct platform_device *pdev,
 	kfree(rdebug.state_before_suspend);
 exit_destroy_power_state:
 	debugfs_remove_recursive(rdebug.dir);
-exit_no_debugfs:
-	dev_err(&pdev->dev, "failed to create debugfs entries.\n");
 	return -ENOMEM;
 }