libxl: libxl__xs_write format string should be const.

George Dunlap reports that gcc 4.4.3 complains:
  libxl_dm.c: In function libxl__create_device_mode:
  libxl_dm.c:776: error: format not a string literal and no format arguments
And indeed the format argument here is a char * from libxl__domain_bios().

Make the argument to libxl__xs_write a const char * and change
libxl__domain_bios to return a const char too.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/libxl/libxl_xshelp.c b/tools/libxl/libxl_xshelp.c
index 3dc9239bcb..1df377c707 100644
--- a/tools/libxl/libxl_xshelp.c
+++ b/tools/libxl/libxl_xshelp.c
@@ -69,7 +69,7 @@ int libxl__xs_writev(libxl__gc *gc, xs_transaction_t t,
 }
 
 int libxl__xs_write(libxl__gc *gc, xs_transaction_t t,
-                   char *path, char *fmt, ...)
+                   char *path, const char *fmt, ...)
 {
     libxl_ctx *ctx = libxl__gc_owner(gc);
     char *s;