Remove name of unused parameter in array-traits.h

2019-09-17  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* array-traits.h (array_traits<T[N]>::size): Remove parameter name.

From-SVN: r275805

gcc/ChangeLog

+2019-09-17  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* array-traits.h (array_traits<T[N]>::size): Remove parameter name.
+
 2019-09-17  Richard Biener  <rguenther@suse.de>
 
 	PR debug/91772

gcc/array-traits.h

@@ -42,7 +42,7 @@ struct array_traits<T[N]>
   static const bool has_constant_size = true;
   static const size_t constant_size = N;
   static const T *base (const T (&x)[N]) { return x; }
-  static size_t size (const T (&x)[N]) { return N; }
+  static size_t size (const T (&)[N]) { return N; }
 };
 
 #endif