ASoC: cs35l45: Corrects cs35l45_get_clk_freq_id function data type

Changes cs35l45_get_clk_freq_id() function data type from unsigned int
to int. This function is returns a positive index value if successful
or a negative error code if unsuccessful.

Functionally there should be no difference as long as the unsigned int
return is interpreted as an int, however it should be corrected for
readability.

Signed-off-by: Ricardo Rivera-Matos <rriveram@opensource.cirrus.com>
Link: https://patch.msgid.link/20240919151654.197337-1-rriveram@opensource.cirrus.com


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