Remove missed usage of @first variable

With the introduction of `#second` method and friends, we added an
offsets hash which replaced the @first variable, so removing it from the
reset method to avoid creating an unused variable now.

Introduced in bc625080308e4853ae3036f2ad74fe3826e463ef.

1 files changed, 1 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 0fc63343ab..17af887abc 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -496,7 +496,7 @@ module ActiveRecord
     end
 
     def reset
-      @first = @last = @to_sql = @order_clause = @scope_for_create = @arel = @loaded = nil
+      @last = @to_sql = @order_clause = @scope_for_create = @arel = @loaded = nil
       @should_eager_load = @join_dependency = nil
       @records = []
       @offsets = {}