drivers: video: api: do not wait the timeout

Fail immediately during tests rather than letting K_FOREVER trigger a CI
timeout.

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

Author: josuah

tests/drivers/video/api/src/video_emul.c

@@ -157,7 +157,7 @@ ZTEST(video_common, test_video_vbuf)
 	zexpect_ok(video_set_format(rx_dev, VIDEO_EP_OUT, &fmt));
 
 	/* Allocate a buffer, assuming prj.conf gives enough memory for it */
-	vbuf = video_buffer_alloc(fmt.pitch * fmt.height, K_FOREVER);
+	vbuf = video_buffer_alloc(fmt.pitch * fmt.height, K_NO_WAIT);
 	zexpect_not_null(vbuf);
 
 	/* Start the virtual hardware */