v4l: rcar-fcp: Don't get/put module reference

Direct callers of the FCP API hold a reference to the FCP module due to
module linkage, there's no need to take another one manually. Take a
reference to the device instead to ensure that it won't disappear behind
the caller's back.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Mauro Cavalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-fcp.c

@@ -53,14 +53,7 @@ struct rcar_fcp_device *rcar_fcp_get(const struct device_node *np)
 		if (fcp->dev->of_node != np)
 			continue;
 
-		/*
-		 * Make sure the module won't be unloaded behind our back. This
-		 * is a poor man's safety net, the module should really not be
-		 * unloaded while FCP users can be active.
-		 */
-		if (!try_module_get(fcp->dev->driver->owner))
-			fcp = NULL;
-
+		get_device(fcp->dev);
 		goto done;
 	}
 
@@ -81,7 +74,7 @@ EXPORT_SYMBOL_GPL(rcar_fcp_get);
 void rcar_fcp_put(struct rcar_fcp_device *fcp)
 {
 	if (fcp)
-		module_put(fcp->dev->driver->owner);
+		put_device(fcp->dev);
 }
 EXPORT_SYMBOL_GPL(rcar_fcp_put);