util/anon_file: const string param

Fixes: c0376a1234 ("util: add anon_file.h for all memfd/temp file usage")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Tested-by: Eric Anholt <eric@anholt.net>
Tested-by: Andreas Baierl <ichgeh@imkreisrum.de>

src/util/anon_file.c

@@ -112,7 +112,7 @@ create_tmpfile_cloexec(char *tmpname)
  * SCM_RIGHTS methods.
  */
 int
-os_create_anonymous_file(off_t size, char *debug_name)
+os_create_anonymous_file(off_t size, const char *debug_name)
 {
    int fd, ret;
 #ifdef __FreeBSD__

src/util/anon_file.h

@@ -28,6 +28,6 @@
 
 #include <sys/types.h>
 
-int os_create_anonymous_file(off_t size, char *debug_name);
+int os_create_anonymous_file(off_t size, const char *debug_name);
 
 #endif