Removed allocator.

examples/heightmap.c

diff --git a/examples/heightmap.c b/examples/heightmap.c
index a55df29..f4bec28 100644
--- a/examples/heightmap.c
+++ b/examples/heightmap.c
@@ -573,7 +573,7 @@
         }
     }
 
-    if (!glfwInit(NULL))
+    if (!glfwInit())
     {
         fprintf(stderr, "ERROR: Unable to initialize GLFW\n");
         usage();