[#1689] client/netmap: Remove useless error-handling

No functional changes.

Change-Id: I3a53c992c3ce5e8c6db252abb09aa40626142a97
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/morph/client/netmap/config.go

@@ -25,44 +25,24 @@ const (
 // MaxObjectSize receives max object size configuration
 // value through the Netmap contract call.
 func (c *Client) MaxObjectSize(ctx context.Context) (uint64, error) {
-	objectSize, err := c.readUInt64Config(ctx, MaxObjectSizeConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return objectSize, nil
+	return c.readUInt64Config(ctx, MaxObjectSizeConfig)
 }
 
 // EpochDuration returns number of sidechain blocks per one FrostFS epoch.
 func (c *Client) EpochDuration(ctx context.Context) (uint64, error) {
-	epochDuration, err := c.readUInt64Config(ctx, EpochDurationConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return epochDuration, nil
+	return c.readUInt64Config(ctx, EpochDurationConfig)
 }
 
 // ContainerFee returns fee paid by container owner to each alphabet node
 // for container registration.
 func (c *Client) ContainerFee(ctx context.Context) (uint64, error) {
-	fee, err := c.readUInt64Config(ctx, ContainerFeeConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return fee, nil
+	return c.readUInt64Config(ctx, ContainerFeeConfig)
 }
 
 // ContainerAliasFee returns additional fee paid by container owner to each
 // alphabet node for container nice name registration.
 func (c *Client) ContainerAliasFee(ctx context.Context) (uint64, error) {
-	fee, err := c.readUInt64Config(ctx, ContainerAliasFeeConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return fee, nil
+	return c.readUInt64Config(ctx, ContainerAliasFeeConfig)
 }
 
 // HomomorphicHashDisabled returns global configuration value of homomorphic hashing
@@ -76,23 +56,13 @@ func (c *Client) HomomorphicHashDisabled(ctx context.Context) (bool, error) {
 // InnerRingCandidateFee returns global configuration value of fee paid by
 // node to be in inner ring candidates list.
 func (c *Client) InnerRingCandidateFee(ctx context.Context) (uint64, error) {
-	fee, err := c.readUInt64Config(ctx, IrCandidateFeeConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return fee, nil
+	return c.readUInt64Config(ctx, IrCandidateFeeConfig)
 }
 
 // WithdrawFee returns global configuration value of fee paid by user to
 // withdraw assets from FrostFS contract.
 func (c *Client) WithdrawFee(ctx context.Context) (uint64, error) {
-	fee, err := c.readUInt64Config(ctx, WithdrawFeeConfig)
-	if err != nil {
-		return 0, err
-	}
-
-	return fee, nil
+	return c.readUInt64Config(ctx, WithdrawFeeConfig)
 }
 
 // MaintenanceModeAllowed reads admission of "maintenance" state from the