[notmuch] Small Fixes

[Matt Fowles]

All~

The attached patches fix a compiler warning in
notmuch_message_get_filename and add the generated test directories to
the .gitignore file.

Matt
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ignore.patch
Type: application/octet-stream
Size: 327 bytes
Desc: not available
URL: <http://notmuchmail.org/pipermail/notmuch/attachments/20100128/585f1d03/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: warning.patch
Type: application/octet-stream
Size: 1964 bytes
Desc: not available
URL: <http://notmuchmail.org/pipermail/notmuch/attachments/20100128/585f1d03/attachment-0001.obj>