ASoC: tas5805m: Improve a size determination in tas5805m_i2c_probe()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Link: https://patch.msgid.link/6a6c87d3-9e4f-4980-ae06-b0d5e16dd0c0@web.de


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