pwm: Fix invalid state detection

Commit 9dd42d0 ("pwm: Allow pwm state transitions from an invalid
state") intended to allow some state transitions that were not allowed
before. The idea is sane and back then I also got the code comment
right, but the check for enabled is bogus. This resulted in state
transitions for enabled states to be allowed to have invalid duty/period
settings and thus it can happen that low-level drivers get requests for
invalid states🙄.

Invert the check to allow state transitions for disabled states only.

Fixes: 9dd42d0 ("pwm: Allow pwm state transitions from an invalid state")
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: [email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

drivers/pwm/core.c

@@ -596,7 +596,7 @@ static bool pwm_state_valid(const struct pwm_state *state)
 	 * and supposed to be ignored. So also ignore any strange values and
 	 * consider the state ok.
 	 */
-	if (state->enabled)
+	if (!state->enabled)
 		return true;
 
 	if (!state->period)