std_streambuf.h (uflow()): It's used only by basic_stringbuf (i.e....

2003-04-21  Paolo Carlini  <pcarlini@unitus.it>

	* include/std/std_streambuf.h (uflow()): It's used only by
	basic_stringbuf (i.e., basic_filebuf provide its own uflow()),
	therefore do not consider the _M_buf_unified == true case.

	* include/std/std_streambuf.h (sgetc()): Restore __ret variable.

From-SVN: r65891