ACPI, APEI, EINJ: Fix error return code in einj_init()

Fix to return -ENOMEM in the debugfs_create_xxx() error handling
case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

drivers/acpi/apei/einj.c

@@ -694,6 +694,7 @@ static int __init einj_init(void)
 	if (rc)
 		goto err_release;
 
+	rc = -ENOMEM;
 	einj_param = einj_get_parameter_address();
 	if ((param_extension || acpi5) && einj_param) {
 		fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,