regulator: fixed-helper: Save a few bytes of memory when registering a 'nfc_llc' engine

regulator_register_always_on() calls pass a string literal as the 'name'
parameter.

So kstrdup_const() can be used instead of kfree() to avoid a memory
allocation in such cases.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://msgid.link/r/3f990a7b80d72c31371735b24ed08acbb8392c80.1705748586.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Mark Brown <broonie@kernel.org>