[patch] flow.c: Don't call sets_cc0_p if insn is NULL_RTX.

[Jan Hubicka]

>   
> +   /* In case we zap a conditional jump, we'll need to kill
> +      the cc0 setter too.  */
> +   kill_from;
Most probably: kill_from = insn

Otherwise such solution looks correct to me (and probably cleaner than
solution I've used).

Honza