leds: core: Omit set_brightness error message for a LED supporting hw trigger only

If both set_brightness functions return -ENOTSUPP, then the LED doesn't
support setting a fixed brightness value, and the error message isn't
helpful. This can be the case e.g. for LEDs supporting a specific hw
trigger only.

Pinched the subject line and commit message from Heiner:
Link: https://lore.kernel.org/all/[email protected]/

Reworked the function to provide Heiner's required semantics whilst
simultaneously increasing readability and flow.

Cc: Pavel Machek <[email protected]>
Cc: [email protected]
Suggested-by: Heiner Kallweit <[email protected]>
Reviewed-by: Heiner Kallweit <[email protected]>
Signed-off-by: Lee Jones <[email protected]>

0 files changed, 0 insertions, 0 deletions