pwm: Remove redundant check in pwm_ops_check()

ops->write_waveform is already known to be non-NULL so there is
no need to check it a second time.

The superflous check was introduced in commit 17e40c2
("pwm: New abstraction for PWM waveforms").

Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Link: https://patch.msgid.link/20260129-fix-pwm-ops-check-v1-1-6f0b7952c875@andestech.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Author: ben717-linux

drivers/pwm/core.c

@@ -1699,8 +1699,7 @@ static bool pwm_ops_check(const struct pwm_chip *chip)
 
 	if (ops->write_waveform) {
 		if (!ops->round_waveform_tohw ||
-		    !ops->round_waveform_fromhw ||
-		    !ops->write_waveform)
+		    !ops->round_waveform_fromhw)
 			return false;
 
 		if (PWM_WFHWSIZE < ops->sizeof_wfhw) {