Fixed: #993 Floating Point Exception in NL3D::CDriverGL::getModes on Linux

code/nel/src/3d/driver/opengl/driver_opengl_window.cpp

@@ -1200,8 +1200,9 @@ bool CDriverGL::getModes(std::vector<GfxMode> &modes)
 			GfxMode mode;
 			mode.Width = (uint16)ms[j]->hdisplay;
 			mode.Height = (uint16)ms[j]->vdisplay;
-			mode.Frequency = 1000 * ms[j]->dotclock / (ms[j]->htotal * ms[j]->vtotal);
-			nldebug("3D:   Mode %d: %dx%d, %d Hz", j, ms[j]->hdisplay,ms[j]->vdisplay, 1000 * ms[j]->dotclock / (ms[j]->htotal * ms[j]->vtotal));
+			const uint16 pixelsCount = ms[j]->htotal * ms[j]->vtotal;
+			mode.Frequency = pixelCount ? 1000 * ms[j]->dotclock / pixelCount:0;
+			nldebug("3D:   Mode %d: %dx%d, %d Hz", j, mode.Width, mode.Height, mode.Frequency);
 			modes.push_back (mode);
 		}
 		XFree(ms);