[PATCH] Always return the empty string if decryption tries to demand a password

[Carl Worth]

On Fri,  3 Jun 2011 19:03:08 -0400, Daniel Kahn Gillmor <dkg at fifthhorseman.net> wrote:
> The notmuch binary is not in the business of doing interactive
> prompting with the user.  If credentials are needed for decryption,
> they should be supplied to the decrypting processes some other way
> (e.g. gpg-agent).
> 
> Previously, we returned a NULL function pointer for the
> request_passwd() function, which may have cause segmentation faults
> with some versions of gmime.

Cool. This fixes my segfaults, so thanks!

> +    return g_strdup ("");

Is the above correct? Or is it a memory leak? (If it's not a leak, then
GMime really has some bizarre ownership semantics.)

-Carl
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