hwc: Use proper typecasts

- Remove compiler warnings
- Use proper typecasts

Change-Id: I7391f32ae31283239f5cebb93b02f3ce3a5c99f3
diff --git a/libhwcomposer/hwc_mdpcomp.h b/libhwcomposer/hwc_mdpcomp.h
index 2d65755..b6615ad 100644
--- a/libhwcomposer/hwc_mdpcomp.h
+++ b/libhwcomposer/hwc_mdpcomp.h
@@ -213,9 +213,8 @@
             hwc_display_contents_1_t* list);
     void reset(hwc_context_t *ctx);
     bool isSupportedForMDPComp(hwc_context_t *ctx, hwc_layer_1_t* layer);
-    bool resourceCheck(hwc_context_t *ctx, hwc_display_contents_1_t *list);
-    hwc_rect_t getUpdatingFBRect(hwc_context_t *ctx,
-            hwc_display_contents_1_t* list);
+    bool resourceCheck();
+    hwc_rect_t getUpdatingFBRect(hwc_display_contents_1_t* list);
 
     int mDpy;
     static bool sEnabled;