[#48] client: Remove ctx == nil checks

Much less useful after we made context to be passed explicitly.

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

client/container_set_eacl.go

@@ -74,10 +74,7 @@ type ResContainerSetEACL struct {
 //   - global (see Client docs).
 func (c *Client) ContainerSetEACL(ctx context.Context, prm PrmContainerSetEACL) (*ResContainerSetEACL, error) {
 	// check parameters
-	switch {
-	case ctx == nil:
-		return nil, errorMissingContext
-	case !prm.tableSet:
+	if !prm.tableSet {
 		return nil, errorEACLTableNotSet
 	}