thermal/drivers/ti-soc-thermal: Avoid dereferencing ERR_PTR

On error the function ti_bandgap_get_sensor_data() returns the error
code in ERR_PTR() but we only checked if the return value is NULL or
not. And, so we can dereference an error code inside ERR_PTR.
While at it, convert a check to IS_ERR_OR_NULL.

Signed-off-by: Sudip Mukherjee <[email protected]>
Reviewed-by: Amit Kucheria <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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