[GRASS5] [bug #3387] (grass) r.flow bug for 3D flow length

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3387
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Subject: r.flow bug for 3D flow length

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: CVS checked out at 20050630

r.flow has broken computation of 3D flowpath length, problem is somewhere here:

line (280 in calc.c)

if (parm.lgout)
            *l += parm.l3d ? hypot(length, oldz - p->z) : length;
return 1; 

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