randr: unexport and document RRModeInitErrorValue()

Not used by any external drivers, so no need to keep it exported.

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

randr/randrstr.h

@@ -609,12 +609,6 @@ extern _X_EXPORT RRModePtr RRModeGet(xRRModeInfo * modeInfo, const char *name);
 extern _X_EXPORT void
  RRModeDestroy(RRModePtr mode);
 
-/*
- * Initialize mode type error value
- */
-extern _X_EXPORT void
- RRModeInitErrorValue(void);
-
 /* rroutput.c */
 
 /*

randr/randrstr_priv.h

@@ -308,4 +308,11 @@ RRModePtr *RRModesForScreen(ScreenPtr pScreen, int *num_ret);
  */
 Bool RRModeInit(void);
 
+/*
+ * Initialize mode type error value
+ *
+ * @return TRUE on success
+ */
+void RRModeInitErrorValue(void);
+
 #endif /* _XSERVER_RANDRSTR_PRIV_H_ */