Remove unused variables.

Author: partim

src/engine.rs

@@ -818,7 +818,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
             manifest_bytes.clone(), self.run.validation.strict
         ) {
             Ok(manifest) => manifest,
-            Err(err) => {
+            Err(_) => {
                 self.metrics.invalid_manifests += 1;
                 warn!(
                     "{}: failed to decode manifest.",
@@ -948,7 +948,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
         // Decode and validate the CRL.
         let mut crl = match Crl::decode(crl_bytes.clone()) {
             Ok(crl) => crl,
-            Err(err) => {
+            Err(_) => {
                 self.metrics.invalid_crls += 1;
                 warn!("{}: failed to decode CRL.", crl_uri);
                 return Ok(None)
@@ -1080,7 +1080,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
             stored_manifest.manifest().clone(), self.run.validation.strict
         ) {
             Ok(manifest) => manifest,
-            Err(err) => {
+            Err(_) => {
                 self.metrics.invalid_manifests += 1;
                 warn!(
                     "{}: failed to decode manifest.",
@@ -1131,7 +1131,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
         // Decode and validate the CRL.
         let mut crl = match Crl::decode(stored_manifest.crl().clone()) {
             Ok(crl) => crl,
-            Err(err) => {
+            Err(_) => {
                 self.metrics.invalid_manifests += 1;
                 self.metrics.invalid_crls += 1;
                 warn!("{}: failed to decode CRL.", crl_uri);
@@ -1277,7 +1277,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
     ) -> Result<(), Failed> {
         let cert = match Cert::decode(content) {
             Ok(cert) => cert,
-            Err(err) => {
+            Err(_) => {
                 manifest.metrics.invalid_certs += 1;
                 warn!("{}: failed to decode certificate.", uri);
                 return Ok(())
@@ -1392,7 +1392,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
             content, self.run.validation.strict
         ) {
             Ok(roa) => roa,
-            Err(err) => {
+            Err(_) => {
                 manifest.metrics.invalid_roas += 1;
                 warn!("{}: failed to decode ROA.", uri);
                 return Ok(())
@@ -1459,7 +1459,7 @@ impl<'a, P: ProcessRun> PubPoint<'a, P> {
             content, self.run.validation.strict
         ) {
             Ok(obj) => obj,
-            Err(err) => {
+            Err(_) => {
                 manifest.metrics.invalid_gbrs += 1;
                 warn!("{}: failed to decode GBR.", uri);
                 return Ok(())