Don't call comphelper::rng::uniform_real_distribution(a,b) with a==b

Change-Id: I95a3ac8da83e02001de13af8d31a04fe0d654dc0

sc/source/core/opencl/opencl_device.cxx

@@ -171,6 +171,8 @@ double timerCurrent(timer* mytimer)
 /* Random number generator */
 double random(double min, double max)
 {
+    if (min == max)
+        return min;
     return comphelper::rng::uniform_real_distribution(min, max);
 }