[RANDR] Don't mark Xinerama as active if no crtcs are enabled. (bug #11504).

Clients expect any Xinerama-enabled screen to report at least one
monitor, but with RandR, there may not be any enabled crtcs. In this case,
tell the client that Xinerama is not active.

randr/rrxinerama.c

@@ -147,12 +147,6 @@ ProcRRXineramaGetState(ClientPtr client)
     return client->noClientException;
 }
 
-static Bool
-RRXineramaScreenActive (ScreenPtr pScreen)
-{
-    return rrGetScrPriv(pScreen) != NULL;
-}
-
 static Bool
 RRXineramaCrtcActive (RRCrtcPtr crtc)
 {
@@ -165,7 +159,7 @@ RRXineramaScreenCount (ScreenPtr pScreen)
     int	i, n;
     
     n = 0;
-    if (RRXineramaScreenActive (pScreen))
+    if (rrGetScrPriv (pScreen))
     {
 	rrScrPriv(pScreen);
 	for (i = 0; i < pScrPriv->numCrtcs; i++)
@@ -175,6 +169,12 @@ RRXineramaScreenCount (ScreenPtr pScreen)
     return n;
 }
 
+static Bool
+RRXineramaScreenActive (ScreenPtr pScreen)
+{
+    return RRXineramaScreenCount (pScreen) > 0;
+}
+
 int
 ProcRRXineramaGetScreenCount(ClientPtr client)
 {