dix: let CreateGCperDepth() accept ScreenPtr instead of screen id

It's only caller already has the ScreenPtr, so it doesn't make any sense
passing in the screen number and let that function retrieve the pointer
on its own again.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

dix/gc.c

@@ -831,13 +831,11 @@ FreeGCperDepth(ScreenPtr pScreen)
 }
 
 Bool
-CreateGCperDepth(int screenNum)
+CreateGCperDepth(ScreenPtr pScreen)
 {
-    ScreenPtr pScreen;
     DepthPtr pDepth;
     GCPtr *ppGC;
 
-    pScreen = screenInfo.screens[screenNum];
     ppGC = pScreen->GCperDepth;
     /* do depth 1 separately because it's not included in list */
     if (!(ppGC[0] = CreateScratchGC(pScreen, 1)))

dix/gc_priv.h

@@ -24,7 +24,7 @@ int FreeGC(void *pGC, XID gid);
 
 void FreeGCperDepth(ScreenPtr pScreen);
 
-Bool CreateGCperDepth(int screenNum);
+Bool CreateGCperDepth(ScreenPtr pScreen);
 
 Bool CreateDefaultStipple(ScreenPtr pScreen);
 

dix/main.c

@@ -216,7 +216,7 @@ dix_main(int argc, char *argv[], char *envp[])
                 FatalError("failed to create screen pixmap properties");
             if (!dixScreenRaiseCreateResources(pScreen))
                 FatalError("failed to create screen resources");
-            if (!CreateGCperDepth(i))
+            if (!CreateGCperDepth(pScreen))
                 FatalError("failed to create scratch GCs");
             if (!CreateDefaultStipple(pScreen))
                 FatalError("failed to create default stipple");