If device gets unplugged after a service fails (happens easily because the socket dies), don't log a provider error.

lib/roles/provider.js

@@ -166,6 +166,11 @@ module.exports = function(options) {
             worker = workers[device.id] = null
           })
           .catch(procutil.ExitError, function(err) {
+            log.error(
+              'Device worker "%s" died with code %s'
+            , device.id
+            , err.code
+            )
             log.info('Restarting device worker "%s"', device.id)
             return Promise.delay(500)
               .then(function() {
@@ -203,11 +208,6 @@ module.exports = function(options) {
             resolver.resolve()
           }
           else {
-            log.error(
-              'Device worker "%s" died with code %s'
-            , device.id
-            , code
-            )
             resolver.reject(new procutil.ExitError(code))
           }
         }