id128: introduce ID128_UUID_STRING_MAX for sizing UUID buffers

src/shared/logs-show.c

@@ -17,6 +17,7 @@
 #include "format-util.h"
 #include "hashmap.h"
 #include "hostname-util.h"
+#include "id128-util.h"
 #include "io-util.h"
 #include "journal-internal.h"
 #include "json.h"
@@ -26,8 +27,8 @@
 #include "namespace-util.h"
 #include "output-mode.h"
 #include "parse-util.h"
-#include "process-util.h"
 #include "pretty-print.h"
+#include "process-util.h"
 #include "sparse-endian.h"
 #include "stdio-util.h"
 #include "string-table.h"
@@ -1353,8 +1354,8 @@ int add_matches_for_user_unit(sd_journal *j, const char *unit, uid_t uid) {
 static int get_boot_id_for_machine(const char *machine, sd_id128_t *boot_id) {
         _cleanup_close_pair_ int pair[2] = { -1, -1 };
         _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, rootfd = -1;
+        char buf[ID128_UUID_STRING_MAX];
         pid_t pid, child;
-        char buf[37];
         ssize_t k;
         int r;