Replace X-allocation functions with their C89 counterparts

The only remaining X-functions used in server are XNF*, the rest is converted to
plain alloc/calloc/realloc/free/strdup.

X* functions are still exported from server and x* macros are still defined in
header file, so both ABI and API are not affected by this change.

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

fb/fballpriv.c

@@ -61,7 +61,7 @@ fbAllocatePrivates(ScreenPtr pScreen, DevPrivateKey *pGCKey)
     {
 	FbScreenPrivPtr	pScreenPriv;
 
-	pScreenPriv = (FbScreenPrivPtr) xalloc (sizeof (FbScreenPrivRec));
+	pScreenPriv = (FbScreenPrivPtr) malloc(sizeof (FbScreenPrivRec));
 	if (!pScreenPriv)
 	    return FALSE;
 	dixSetPrivate(&pScreen->devPrivates, fbScreenPrivateKey, pScreenPriv);