drivers: audio: dmic_nrfx: fix memory leak

Ensure proper release of memory slab when dmm_buffer_in_release fails in
the event_handler function.

(cherry picked from commit 7333349)

Original-Signed-off-by: Benjamin Cabé <[email protected]>
GitOrigin-RevId: 7333349
Cr-Build-Id: 8711682253588645601
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8711682253588645601
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I85de5f95ebf59ea8a49fdfda938f05c80b4b00f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/6655862
Tested-by: Yuval Peress <[email protected]>
Commit-Queue: Keith Short <[email protected]>
Tested-by: Keith Short <[email protected]>
Reviewed-by: Keith Short <[email protected]>
Tested-by: ChromeOS Copybot <[email protected]>
Reviewed-by: Yuval Peress <[email protected]>

Author: Benjamin Cabé

drivers/audio/dmic_nrfx_pdm.c

@@ -148,6 +148,7 @@ static void event_handler(const struct device *dev, const nrfx_pdm_evt_t *evt)
 						    drv_data->block_size, evt->buffer_released);
 			if (ret < 0) {
 				LOG_ERR("Failed to release buffer: %d", ret);
+				free_buffer(drv_data, mem_slab_buffer);
 				return;
 			}
 			free_buffer(drv_data, mem_slab_buffer);
@@ -172,6 +173,7 @@ static void event_handler(const struct device *dev, const nrfx_pdm_evt_t *evt)
 					    drv_data->block_size, evt->buffer_released);
 		if (ret < 0) {
 			LOG_ERR("Failed to release buffer: %d", ret);
+			free_buffer(drv_data, mem_slab_buffer);
 			stop_pdm(drv_data);
 			return;
 		}