Fix gcc warnings in Rend2.

code/rend2/tr_backend.c

@@ -763,7 +763,7 @@ void RB_RenderDrawSurfList( drawSurf_t *drawSurfs, int numDrawSurfs ) {
 					{
 						depth[0] = 0;
 						depth[1] = 0.3f;
- 						qglDepthRange (0, 0.3);
+ 						qglDepthRange (depth[0], depth[1]);
 	 				}
 #endif
 				}