[Bug 1956] sftp segfaults in parse_args() when argv[0] is NULL

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https://bugzilla.mindrot.org/show_bug.cgi?id=1956

--- Comment #1 from Loganaden Velvindron <loganaden at gmail.com> 2011-12-11 07:46:51 EST ---
Created attachment 2117
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2117
return -1 when argv[0] is NULL instead of continuing further

when argv[0] is set to NULL, return -1.

This fixes the segfault. I'm still looking
into what causes its value to be set to NULL.

Thanks to Eldergod Selven who allowed me to play
with his iMac ;-)

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