kconfig: exit if no beginning filename
If the beginning Kconfig file is missing, config segfaults so it might as well exit after the error message. Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
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