ACPI: APEI: remove redundant assignment to variable rc

The variable rc is being assigned a value that is never read,
the assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/apei/einj.c

@@ -725,7 +725,6 @@ static int __init einj_init(void)
 		goto err_release;
 	}
 
-	rc = -ENOMEM;
 	einj_param = einj_get_parameter_address();
 	if ((param_extension || acpi5) && einj_param) {
 		debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,