random.h (negative_binomial_distribution<>:: negative_binomial_distribution(_IntType, double), [...]): Tweak construction of _M_gd.

2011-03-25  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/random.h (negative_binomial_distribution<>::
	negative_binomial_distribution(_IntType, double),
	negative_binomial_distribution<>::
	negative_binomial_distribution(const param_type&)): Tweak
	construction of _M_gd.
	* include/bits/random.tcc (negative_binomial_distribution<>::
	operator()): Adjust.

From-SVN: r171443