[PR #1355] os: make XNFvasprintf() static

PR: https://github.com/X11Libre/xserver/pull/1355

include/Xprintf.h

@@ -53,8 +53,5 @@
 extern _X_EXPORT int /* deprecated */
 XNFasprintf(char **ret, const char *_X_RESTRICT_KYWD fmt, ...)
 _X_ATTRIBUTE_PRINTF(2, 3);
-extern _X_EXPORT int
-XNFvasprintf(char **ret, const char *_X_RESTRICT_KYWD fmt, va_list va)
-_X_ATTRIBUTE_VPRINTF(2, 0);
 
 #endif                          /* XPRINTF_H */

os/xprintf.c

@@ -67,6 +67,9 @@
 #include "include/os.h"
 #include "include/Xprintf.h"
 
+static int XNFvasprintf(char **ret, const char *_X_RESTRICT_KYWD fmt, va_list va)
+_X_ATTRIBUTE_PRINTF(2, 0);
+
 /**
  * Varargs sprintf that allocates a string buffer the right size for
  * the pattern & data provided and prints the requested data to it.
@@ -78,7 +81,7 @@
  * @param va      variable argument list
  * @return        size of allocated buffer
  */
-int
+static int
 XNFvasprintf(char **ret, const char *_X_RESTRICT_KYWD format, va_list va)
 {
     int size = vasprintf(ret, format, va);