Update sss_ssh.c
    
    SSH: Adds a message to the syslog if an SSH key is malformed
    
    If an SSH key contains trailing whitespace (or newlines), it will be considered as malformed by sss_ssh_format_pubkey() function. With the current version the only way to detect that problem is to enable --debug option for /usr/bin/sss_ssh_authorizedkeys utility. I'm adding an additional message to the syslog which will help to determine such problems without enabling debug.
    
    Resolves: https://pagure.io/SSSD/sssd/issue/3864
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>