damage: Clean up warnings

GC funcs and ops are const now, so all wrappers need to declare them
as such.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

miext/damage/damage.c

@@ -359,7 +359,7 @@ damageCreateGC(GCPtr pGC)
 
 #define DAMAGE_GC_OP_PROLOGUE(pGC, pDrawable) \
     damageGCPriv(pGC);  \
-    GCFuncs *oldFuncs = pGC->funcs; \
+    const GCFuncs *oldFuncs = pGC->funcs; \
     unwrap(pGCPriv, pGC, funcs);  \
     unwrap(pGCPriv, pGC, ops); \
 
@@ -379,7 +379,6 @@ damageCreateGC(GCPtr pGC)
 static void
 damageValidateGC(GCPtr pGC, unsigned long changes, DrawablePtr pDrawable)
 {
-    drawableDamage(pDrawable);
     DAMAGE_GC_FUNC_PROLOGUE(pGC);
     (*pGC->funcs->ValidateGC) (pGC, changes, pDrawable);
     pGCPriv->ops = pGC->ops; /* just so it's not NULL */

miext/damage/damagestr.h

@@ -76,8 +76,8 @@ typedef struct _damageScrPriv {
 } DamageScrPrivRec, *DamageScrPrivPtr;
 
 typedef struct _damageGCPriv {
-    GCOps *ops;
-    GCFuncs *funcs;
+    const GCOps *ops;
+    const GCFuncs *funcs;
 } DamageGCPrivRec, *DamageGCPrivPtr;
 
 /* XXX should move these into damage.c, damageScrPrivateIndex is static */