gswitchit coredumps (doesn't check input strict enough) [PATCH]

[Sergey Akifyev]

Hello!

gswitchit dumps core when parsing my Xkb configuration. I traced the bug
with GDB, and fixed this issue. Patch is attached.
-- 
regards,
Sergey Akifyev <asa at gascom.ru>
JSC Gascom <http://www.gascom.ru>
PGP key available from:
ftp://ftp.gascom.ru/pub/PGP-keys/asa.txt
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