staging: gpib: cec: Handle gpib_register_driver() errors

The function gpib_register_driver() can fail and result in a
semi-registered module and does not return an error value if it
fails.

Unregister the pci registering function in case gpib_register_driver()
fails and return the error value. Add pr_err() statements indicating the
fail and also the error value.

Signed-off-by: Nihar Chaithanya <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: niharcy

drivers/staging/gpib/cec/cec_gpib.c

@@ -365,11 +365,15 @@ static int __init cec_init_module(void)
 
 	result = pci_register_driver(&cec_pci_driver);
 	if (result) {
-		pr_err("cec_gpib: pci_driver_register failed!\n");
+		pr_err("cec_gpib: pci_register_driver failed: error = %d\n", result);
 		return result;
 	}
 
-	gpib_register_driver(&cec_pci_interface, THIS_MODULE);
+	result = gpib_register_driver(&cec_pci_interface, THIS_MODULE);
+	if (result) {
+		pr_err("cec_gpib: gpib_register_driver failed: error = %d\n", result);
+		return result;
+	}
 
 	return 0;
 }