fix a -Wmaybe-uninitialized warning

deez nuts are being used unitialised
this will only ever be used with TC_RAINBOW so why not move it into the condition for it?

src/hardware/hw_md2.c

@@ -823,10 +823,9 @@ static void HWR_CreateBlendedTexture(patch_t *gpatch, patch_t *blendgpatch, GLMi
 				}
 			}
 		}
-	}
 
-	if (translen > 0)
 		colorbrightnesses[translen] = colorbrightnesses[translen-1];
+	}
 
 	if (skinnum == TC_BLINK)
 		blendcolor = V_GetColor(skincolors[color].ramp[3]);