coverity issue CID: 228

Checker: DEADCODE (help)
File: base/src/source/blender/gpu/intern/gpu_material.c
Function: GPU_materials_free
Description: Conditional "ma != 0"

was looping over wrong variable I'm guessing a cut and
paste error from above.

Kent

source/blender/gpu/intern/gpu_material.c

@@ -1285,7 +1285,7 @@ void GPU_materials_free()
 
 	GPU_material_free(&defmaterial);
 
-	for(ob=G.main->object.first; ma; ma=ma->id.next)
+	for(ob=G.main->object.first; ob; ob=ob->id.next)
 		GPU_lamp_free(ob);
 }