[PATCH v2 1/3] Docs: usb: update err() to pr_err() and replace __FILE__

[Philipp Hortmann <philipp.g.hortmann@gmail.com>]

update err() to pr_err() and replace __FILE__

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
---
V1 -> V2: changed kernel message to be in one line
          added missing "n\"
---
 Documentation/driver-api/usb/writing_usb_driver.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/driver-api/usb/writing_usb_driver.rst b/Documentation/driver-api/usb/writing_usb_driver.rst
index 2176297e5765..85e106f443e5 100644
--- a/Documentation/driver-api/usb/writing_usb_driver.rst
+++ b/Documentation/driver-api/usb/writing_usb_driver.rst
@@ -91,8 +91,8 @@ usually in the driver's init function, as shown here::
 	    /* register this driver with the USB subsystem */
 	    result = usb_register(&skel_driver);
 	    if (result < 0) {
-		    err("usb_register failed for the "__FILE__ "driver."
-			"Error number %d", result);
+		    pr_err("usb_register failed for the %s driver. Error number %d\n",
+		           skel_driver.name, result);
 		    return -1;
 	    }
 
-- 
2.25.1