repart: initialize seed earlier

As the seed is used by context_load_partition_table() -> derive_uuid().

Fixes #34257.

(cherry picked from commit b8a8000aba4620a1d93ac1d04dbb86050d9c5fe8)
(cherry picked from commit f85a4fba330822c44f9b2deb527acecc03bcfed9)
(cherry picked from commit 175dafa)

src/partition/repart.c

@@ -6957,6 +6957,10 @@ static int run(int argc, char *argv[]) {
         if (!context)
                 return log_oom();
 
+        r = context_read_seed(context, arg_root);
+        if (r < 0)
+                return r;
+
         strv_uniq(arg_definitions);
 
         r = context_read_definitions(context);
@@ -7012,10 +7016,6 @@ static int run(int argc, char *argv[]) {
                         return r;
         }
 
-        r = context_read_seed(context, arg_root);
-        if (r < 0)
-                return r;
-
         /* Make sure each partition has a unique UUID and unique label */
         r = context_acquire_partition_uuids_and_labels(context);
         if (r < 0)