Fix PWM #301

Job	Run time
slow-tests	6m 49s
slow-tests	5m 2s
slow-tests	5m 2s
slow-tests	5m 2s
quick-tests	30s
quick-tests	25s
quick-tests	25s
quick-tests	25s
build	26s
build	31s
build	31s
build	31s
cross-compile-bench (armv7-unknown-linux-gnueabihf)	1m 29s
cross-compile-bench (armv7-unknown-linux-gnueabihf)	1m 9s
cross-compile-bench (armv7-unknown-linux-gnueabihf)	1m 9s
cross-compile-bench (armv7-unknown-linux-gnueabihf)	1m 9s
deploy	0s
deploy	0s
deploy	0s
deploy	0s
run-bench	0s
run-bench	5m 2s
run-bench	4m 59s
run-bench	12m 22s
	52m 58s

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