audio: add NULL check for SR recorder #516

Job	Run time
trigger workflow based on changed files	9s
trigger workflow based on changed files	39s
trigger workflow based on changed files	45s
trigger workflow based on changed files	27s
trigger workflow based on changed files	18s
build_container	0s
build_container	0s
build_container	0s
build_container	0s
build_container	0s
build_willow	0s
build_willow	0s
build_willow	0s
build_willow / build-willow-dist (ESP32-S3-BOX)	1m 30s
build_willow / build-willow-dist (ESP32-S3-BOX)	3m 57s
build_willow / build-willow-dist (ESP32-S3-BOX-3)	1m 29s
build_willow / build-willow-dist (ESP32-S3-BOX-3)	4m 0s
build_willow / build-willow-dist (ESP32-S3-BOX-LITE)	1m 22s
build_willow / build-willow-dist (ESP32-S3-BOX-LITE)	4m 5s
build_willow / publish-release	0s
build_willow / publish-release	0s
	18m 41s

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