target: Misc retval cleanups

Bubble-up retval from iscsi_update_param_value() and
iscsit_ta_authentication().

Other very small retval cleanups.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index ed5241e..0c4760f 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -681,7 +681,7 @@
 	param->value = kzalloc(strlen(value) + 1, GFP_KERNEL);
 	if (!param->value) {
 		pr_err("Unable to allocate memory for value.\n");
-		return -1;
+		return -ENOMEM;
 	}
 
 	memcpy(param->value, value, strlen(value));