Merge pull request #5182 from sum2012/patch-2

Fix "Integer divide by zero"  in Spline.cpp

GPU/GLES/Spline.cpp

@@ -816,6 +816,8 @@ void TransformDrawEngine::SubmitBezier(void* control_points, void* indices, int
 	// Simple approximation of the real tesselation factor.
 	// We shouldn't really split up into separate 4x4 patches, instead we should do something that works
 	// like the splines, so we subdivide across the whole "mega-patch".
+	if (num_patches_u == 0) num_patches_u = 1;
+	if (num_patches_v == 0) num_patches_v = 1;
 	int tess_u = gstate.getPatchDivisionU() / num_patches_u;
 	int tess_v = gstate.getPatchDivisionV() / num_patches_v;
 	if (tess_u < 4) tess_u = 4;