Use value-init syntax in std::__detail::__airy

	* include/tr1/modified_bessel_func.tcc (__airy): Use value-init not
	list-init.

From-SVN: r255313

libstdc++-v3/ChangeLog

 2017-12-01  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/tr1/modified_bessel_func.tcc (__airy): Use value-init not
+	list-init.
+
 	* include/std/type_traits (integral_constant): Make member functions
 	noexcept (LWG 2346).
 	* include/std/utility (integer_sequence): Likewise.

libstdc++-v3/include/tr1/modified_bessel_func.tcc

@@ -384,11 +384,11 @@ namespace tr1
         __Bip = __Aip = __Bi = __Ai = std::numeric_limits<_Tp>::quiet_NaN();
       else if (__z == _S_inf)
         {
-	  __Aip = __Ai = _Tp{0};
+	  __Aip = __Ai = _Tp(0);
 	  __Bip = __Bi = _S_inf;
 	}
       else if (__z == -_S_inf)
-	__Bip = __Aip = __Bi = __Ai = _Tp{0};
+	__Bip = __Aip = __Bi = __Ai = _Tp(0);
       else if (__x > _Tp(0))
         {
           _Tp __I_nu, __Ip_nu, __K_nu, __Kp_nu;