Reuse return from keys_in_common

Author: ZeroInputCtrl

lib/grape/validations/validators/exactly_one_of.rb

@@ -6,9 +6,10 @@ module Grape
   module Validations
     class ExactlyOneOfValidator < MultipleParamsBase
       def validate_params!(params)
-        return if keys_in_common(params).length == 1
-        raise Grape::Exceptions::Validation.new(params: all_keys, message: message(:exactly_one)) if keys_in_common(params).length.zero?
-        raise Grape::Exceptions::Validation.new(params: keys_in_common(params), message: message(:mutual_exclusion))
+        keys = keys_in_common(params)
+        return if keys.length == 1
+        raise Grape::Exceptions::Validation.new(params: all_keys, message: message(:exactly_one)) if keys.length.zero?
+        raise Grape::Exceptions::Validation.new(params: keys, message: message(:mutual_exclusion))
       end
     end
   end