[packagekit] pk-application compile failure

[Scott Reeves]

Richard, 

The commit adding G_GNUC_WARN_UNUSED_RESULT to pk_extra_set_database broke pk-application.c.  I committed a fix checking the return val but I was not sure how critical it was so I only made it a warning.  You may want to change that.

Sigh - just realized I forgot to set my GIT_AUTHOR_NAME so that commit came in as a generic user.

Thanks,
Scott.