gdb/

gdb/
	Code cleanup.
	* dwarf2read.c (dw2_expand_symtabs_with_filename): Rename to ...
	(dw2_expand_symtabs_with_fullname): ... here.  Rename parameter
	filename to fullname.  Rename variable this_name to this_fullname.
	Lowercase FILENAME_CMP call.
	(dw2_find_symbol_file): New comment for the returned string.
	(dwarf2_gdb_index_functions): Rename the function to
	dw2_expand_symtabs_with_fullname.
	* psymtab.c (read_psymtabs_with_filename): Rename to ...
	(read_psymtabs_with_fullname): ... here.  Rename parameter filename to
	fullname.
	(psym_functions): Rename the function to read_psymtabs_with_fullname.
	* symfile.h (struct quick_symbol_functions): Rename field
	expand_symtabs_with_filename to expand_symtabs_with_fullname and its
	parameter filename to fullname.  Document returned string meaning for
	find_symbol_file.
	* symtab.c (find_line_symtab): Rename the called function to
	expand_symtabs_with_fullname.