ASoc: tas2783A: Fix an error code in probe()

This code returns the wrong variable "tas_dev->regmap" instead of
"regmap" so it returns success instead of a negative error code.
Return the correct variable.

Fixes: 4cc9bd8d ("ASoc: tas2783A: Add soundwire based codec driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/aNYQf4cyavnku5Nt@stanley.mountain


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