greybus: camera: Add missing return value

Add missing return value assignement when changing unipro power mode to
PWM-G1.

Signed-off-by: Jacopo Mondi <jacopo.mondi@linaro.org>
Reviewed-by: Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/camera.c

@@ -296,7 +296,7 @@ set_unipro_slow_mode:
 		goto done;
 	}
 
-	gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
+	ret = gb_svc_intf_set_power_mode(svc, svc->ap_intf_id,
 				   GB_SVC_UNIPRO_HS_SERIES_A,
 				   GB_SVC_UNIPRO_SLOW_AUTO_MODE,
 				   1, 2,
@@ -307,7 +307,6 @@ set_unipro_slow_mode:
 		gcam_err(gcam, "can't take AP link to PWM-G1 auto: %d\n",
 			 ret);
 
-
 done:
 	kfree(req);
 	kfree(resp);