samples: drivers: video: capture: switch to K_NO_WAIT

Make video allocation non-blocking (K_NO_WAIT) and return an error
verbosely rather than get the example get stuck.

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

samples/drivers/video/capture/src/main.c

@@ -318,7 +318,7 @@ static int app_setup_video_buffers(const struct device *const video_dev,
 		 * buffer alignment is needed in order to achieve the best performance
 		 */
 		vbuf = video_buffer_aligned_alloc(fmt->size, CONFIG_VIDEO_BUFFER_POOL_ALIGN,
-						  K_FOREVER);
+						  K_NO_WAIT);
 		if (vbuf == NULL) {
 			LOG_ERR("Unable to alloc video buffer");
 			return -ENOMEM;