staging: gpib: hp_82335: Return error value from gpib_register_driver()

The function gpib_register_driver() can fail and does not return an
error value if it fails.

Return the error value if gpib_register_driver() fails. Add pr_err()
statement indicating the fail and also the error value.

Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
Link: https://lore.kernel.org/r/20241230185633.175690-10-niharchaithanya@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: niharcy

drivers/staging/gpib/hp_82335/hp82335.c

@@ -325,7 +325,13 @@ void hp82335_detach(gpib_board_t *board)
 
 static int __init hp82335_init_module(void)
 {
-	gpib_register_driver(&hp82335_interface, THIS_MODULE);
+	int result = gpib_register_driver(&hp82335_interface, THIS_MODULE);
+
+	if (result) {
+		pr_err("hp82335: gpib_register_driver failed: error = %d\n", result);
+		return result;
+	}
+
 	return 0;
 }