[PATCH] smbpasswd - fix crashes on invalid input.

[Jeremy Allison]

Fix for bug #10320, found by Joonas @ Codenomicon.

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# echo test | /opt/superdemo/samba/bin/smbpasswd -a test
New SMB password:
Retype new SMB password:Segmentation fault
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Oops :-).

Problem is callers of get_pass() don't cope
with NULL return.

Please review + push if appropriate.

Thanks !

Jeremy.
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