Comment # 7 on bug 931956 from Egbert Eich

Forgot to mention: this patch is upstream:

commit f4ddb33f2168acfee0034379c2f69c82e0aa768a
Author: Egbert Eich <eich@suse.de>
Date:   Fri May 22 10:36:03 2015 +0200

    dm: Don't crash if argc == 0

    It is not guaranteed that argc > 0. So make sure we don't crash
    if no valid command line arguments are given.

    Signed-off-by: Egbert Eich <eich@suse.de>
    Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>