Fixed linter errors

src/models/hardware.rb

@@ -5,13 +5,11 @@ class Hardware < Sequel::Model(:hardware)
 
   one_to_many :results
 
-  def bench_results()
-    br = Hash.new()
+  def bench_results
+    br = {}
 
-    self.results.each do |r|
-      unless br.key?(r.benchmark.name)
-        br[r.benchmark.name.to_s] = []
-      end
+    @results.each do |r|
+      br[r.benchmark.name.to_s] = [] unless br.key?(r.benchmark.name)
 
       br[r.benchmark.name.to_s].push(r.avg_score)
     end