Konstantin Belousov 9ae781dfcf Signal 0 is used to check the permission for current process to signal
target one. Since r184058, linux_do_tkill() calls tdsignal() instead of
kill(), without checking for validity of supplied signal number. Prevent
panic when supplied signal is 0 by finishing work after checks.

Found and tested by:	scf
MFC after:	3 days
2009-12-18 14:27:18 +00:00
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