[patch] virtio: console: fix error handling for debugfs_create_dir()

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

debugfs_create_dir() returns ERR_PTR(-ENODEV) if debugfs is disabled.
Also my static checker doesn't like it when we print the error code, but
it's always just NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 1b456fe..ad2cd6d 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -2215,7 +2215,7 @@ static int __init init(void)
 	}
 
 	pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL);
-	if (!pdrvdata.debugfs_dir) {
+	if (IS_ERR_OR_NULL(pdrvdata.debugfs_dir)) {
 		pr_warning("Error %ld creating debugfs dir for virtio-ports\n",
 			   PTR_ERR(pdrvdata.debugfs_dir));
 	}
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