crash fix - dwm - dynamic window manager
 (HTM) git clone https://git.parazyd.org/dwm
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       ---
 (DIR) commit 8f052596b2c79e74c0e47b93595f13a754b3e2ef
 (DIR) parent 9463d5354bc57d0c0086b7328196d7af60ed706d
 (HTM) Author: Anselm R Garbe <garbeam@gmail.com>
       Date:   Wed, 11 Jun 2008 19:42:24 +0100
       
       crash fix
       Diffstat:
         M dwm.c                               |       2 +-
       
       1 file changed, 1 insertion(+), 1 deletion(-)
       ---
 (DIR) diff --git a/dwm.c b/dwm.c
       @@ -1478,7 +1478,7 @@ togglefloating(const Arg *arg) {
        
        void
        togglelayout(const Arg *arg) {
       -        if(arg->v)
       +        if(arg && arg->v)
                        lt = (Layout *)arg->v;
                else if(++lt == &layouts[LENGTH(layouts)])
                        lt = &layouts[0];