std_sstream.h (basic_stringbuf::str(const __string_type&)): Prefer data() to c_str() thus avoiding assigning the unnecessary NULL-terminator.

2002-11-05  Jonathan Wakely  <cow@compsoc.man.ac.uk>

	* include/std/std_sstream.h
	(basic_stringbuf::str(const __string_type&)):
	Prefer data() to c_str() thus avoiding assigning the
	unnecessary NULL-terminator.

From-SVN: r58844