Fix rubocop warnings in lib

lib/api/helpers.rb

@@ -149,7 +149,6 @@ module API
     end
 
     def attributes_for_keys(keys, custom_params = nil)
-      params_hash = custom_params || params
       attrs = {}
       keys.each do |key|
         if params[key].present? or (params.has_key?(key) and params[key] == false)

lib/event_filter.rb

@@ -47,7 +47,7 @@ class EventFilter
 
     actions << Event::COMMENTED if filter.include? 'comments'
 
-    events = events.where(action: actions)
+    events.where(action: actions)
   end
 
   def options(key)

lib/gitlab/contributions_calendar.rb

@@ -12,7 +12,6 @@ module Gitlab
 
       @timestamps = {}
       date_from = 1.year.ago
-      date_to = Date.today
 
       events = Event.reorder(nil).contributions.where(author_id: user.id).
         where("created_at > ?", date_from).where(project_id: projects).

lib/gitlab/diff/parser.rb

@@ -14,8 +14,6 @@ module Gitlab
         lines_arr = ::Gitlab::InlineDiff.processing lines
 
         lines_arr.each do |line|
-          raw_line = line.dup
-
           next if filename?(line)
 
           full_line = html_escape(line.gsub(/\n/, ''))

lib/gitlab/fogbugz_import/project_creator.rb

@@ -23,7 +23,7 @@ module Gitlab
           import_url: Project::UNKNOWN_IMPORT_URL
         ).execute
 
-        import_data = project.create_import_data(
+        project.create_import_data(
           data: {
             'repo' => repo.raw_data,
             'user_map' => user_map,

lib/gitlab/google_code_import/project_creator.rb

@@ -23,7 +23,7 @@ module Gitlab
           import_url: repo.import_url
         ).execute
 
-        import_data = project.create_import_data(
+        project.create_import_data(
           data: {
             "repo"      => repo.raw_data,
             "user_map"  => user_map