sstream.tcc (pbackfail): Remove redundant NULL pointer check from test involving...

sstream.tcc (pbackfail): Remove redundant NULL pointer check from test involving _M_in_*.

2003-04-20  Paolo Carlini  <pcarlini@unitus.it>

	* include/bits/sstream.tcc (pbackfail): Remove redundant
	NULL pointer check from test involving _M_in_*.
	(overflow, seekoff, seekpos): Const qualify bool variables.
	* include/std/std_sstream.h (underflow): Remove redundant
	NULL pointer check from test involving _M_in_*.
	(_M_really_sync): Const qualify bool variables.
	* src/fstream.cc (_M_underflow_common): Remove redundant
	NULL pointer check from test involving _M_in_*, const qualify
	bool variables.

	* include/std/std_streambuf.h (sgetc): Remove redundant
	variable.

From-SVN: r65853