Appease Coverity
    
    There is only one call site of gpp_store_remote_creds(), and it already checks
    that `creds != NULL`, so we don't need to duplicate the check.
    
    Signed-off-by: Robbie Harwood <rharwood@redhat.com>
    Reviewed-by: Simo Sorce <simo@redhat.com>
    PR: #52