deduplicate max_label calculation

Python/flowgraph.c

@@ -575,16 +575,23 @@ check_cfg(cfg_builder *g) {
     return SUCCESS;
 }
 
-/* Calculate the actual jump target from the target_label */
 static int
-translate_jump_labels_to_targets(basicblock *entryblock)
+get_max_label(basicblock *entryblock)
 {
-    int max_label = -1;
+    int lbl = -1;
     for (basicblock *b = entryblock; b != NULL; b = b->b_next) {
-        if (b->b_label.id > max_label) {
-            max_label = b->b_label.id;
+        if (b->b_label.id > lbl) {
+            lbl = b->b_label.id;
         }
     }
+    return lbl;
+}
+
+/* Calculate the actual jump target from the target_label */
+static int
+translate_jump_labels_to_targets(basicblock *entryblock)
+{
+    int max_label = get_max_label(entryblock);
     size_t mapsize = sizeof(basicblock *) * (max_label + 1);
     basicblock **label2block = (basicblock **)PyMem_Malloc(mapsize);
     if (!label2block) {
@@ -2230,18 +2237,6 @@ is_exit_without_lineno(basicblock *b) {
 }
 
 
-static int
-max_label(cfg_builder *g)
-{
-    int lbl = -1;
-    for (basicblock *b = g->g_entryblock; b != NULL; b = b->b_next) {
-        if (b->b_label.id > lbl) {
-            lbl = b->b_label.id;
-        }
-    }
-    return lbl;
-}
-
 /* PEP 626 mandates that the f_lineno of a frame is correct
  * after a frame terminates. It would be prohibitively expensive
  * to continuously update the f_lineno field at runtime,
@@ -2256,7 +2251,7 @@ duplicate_exits_without_lineno(cfg_builder *g)
 {
     assert(no_empty_basic_blocks(g));
 
-    int next_lbl = max_label(g) + 1;
+    int next_lbl = get_max_label(g->g_entryblock) + 1;
 
     /* Copy all exit blocks without line number that are targets of a jump.
      */