render/wiiu: Fix compiler warnings

src/render/wiiu/SDL_rdraw_wiiu.c

@@ -37,6 +37,7 @@
 #include <gx2/clear.h>
 #include <gx2/mem.h>
 #include <gx2/event.h>
+#include <gx2r/surface.h>
 #include <gx2r/buffer.h>
 #include <gx2r/draw.h>
 

src/render/wiiu/SDL_render_wiiu.c

@@ -189,7 +189,6 @@ void WIIU_SDL_DestroyRenderer(SDL_Renderer * renderer)
 int WIIU_SDL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                               Uint32 format, void * pixels, int pitch)
 {
-    WIIU_RenderData *data = (WIIU_RenderData *) renderer->driverdata;
     SDL_Texture* target = WIIU_GetRenderTarget(renderer);
     WIIU_TextureData* tdata = (WIIU_TextureData*) target->driverdata;
 

src/render/wiiu/SDL_rpresent_wiiu.c

@@ -9,8 +9,9 @@
 #include "SDL_render_wiiu.h"
 
 #include <whb/gfx.h>
-#include <gx2/draw.h>
+#include <gx2/registers.h>
 #include <gx2/state.h>
+#include <gx2/draw.h>
 #include <gx2r/buffer.h>
 #include <gx2r/draw.h>
 

src/render/wiiu/SDL_rtexture_wiiu.c

@@ -188,17 +188,23 @@ int WIIU_SDL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
 int WIIU_SDL_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
 {
     WIIU_TextureData *tdata = (WIIU_TextureData *) texture->driverdata;
+
     /* Compute color mod */
     tdata->u_mod.r = (float)texture->r / 255.0f;
     tdata->u_mod.g = (float)texture->g / 255.0f;
     tdata->u_mod.b = (float)texture->b / 255.0f;
+
+    return 0;
 }
 
 int WIIU_SDL_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
 {
     WIIU_TextureData *tdata = (WIIU_TextureData *) texture->driverdata;
+
     /* Compute alpha mod */
     tdata->u_mod.a = (float)texture->a / 255.0f;
+
+    return 0;
 }
 
 void WIIU_SDL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)