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	Fix (hopefully temporary) for breakage caused by my 08-21 patch.
	* cpplex.c (_cpp_get_fresh_line):  Check for null buffer.
	(_cpp_lex_buffer):  Likewise.
	* cpptrad.c (_cpp_read_logical_line_trad):  Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@70898 138bc75d-0d04-0410-961f-82ee72b054a4