gdb/

gdb/
	Code cleanup.
	* mi/mi-cmd-stack.c (list_args_or_locals): Remove stb initialization
	and the static keyword.
	* mi/mi-cmd-target.c (mi_cmd_target_file_get, mi_cmd_target_file_put):
	Make prefix an array.
	* mi/mi-cmd-target.c (mi_cmd_target_file_delete): Likewise.
	* mi/mi-main.c (get_register): Remove stb initialization and the static
	keyword.