golint: remove redundant ifs

cli/command/trust/sign.go

@@ -243,8 +243,5 @@ func addStagedSigner(notaryRepo client.Repository, newSigner data.RoleName, sign
 	if err := notaryRepo.AddDelegationRoleAndKeys(trust.ReleasesRole, signerKeys); err != nil {
 		return err
 	}
-	if err := notaryRepo.AddDelegationPaths(trust.ReleasesRole, []string{""}); err != nil {
-		return err
-	}
-	return nil
+	return notaryRepo.AddDelegationPaths(trust.ReleasesRole, []string{""})
 }

cli/command/trust/signer_remove.go

@@ -131,8 +131,5 @@ func removeSingleSigner(cli command.Cli, repoName, signerName string, forceYes b
 	if err = notaryRepo.RemoveDelegationRole(signerDelegation); err != nil {
 		return err
 	}
-	if err = notaryRepo.Publish(); err != nil {
-		return err
-	}
-	return nil
+	return notaryRepo.Publish()
 }

cmd/docker/docker.go

@@ -249,12 +249,7 @@ func isSupported(cmd *cobra.Command, details versionDetails) error {
 	if err := areSubcommandsSupported(cmd, details); err != nil {
 		return err
 	}
-
-	if err := areFlagsSupported(cmd, details); err != nil {
-		return err
-	}
-
-	return nil
+	return areFlagsSupported(cmd, details)
 }
 
 func areFlagsSupported(cmd *cobra.Command, details versionDetails) error {

docs/yaml/yaml.go

@@ -79,10 +79,7 @@ func GenYamlTreeCustom(cmd *cobra.Command, dir string, filePrepender func(string
 	if _, err := io.WriteString(f, filePrepender(filename)); err != nil {
 		return err
 	}
-	if err := GenYamlCustom(cmd, f); err != nil {
-		return err
-	}
-	return nil
+	return GenYamlCustom(cmd, f)
 }
 
 // GenYamlCustom creates custom yaml output