Fix UPB fast table build.

PiperOrigin-RevId: 723552474

Author: protobuf-github-bot

upb/mini_table/internal/message.h

@@ -64,7 +64,7 @@ struct upb_MiniTable {
   const char* UPB_PRIVATE(full_name);
 #endif
 
-#ifdef UPB_FASTTABLE_ENABLED
+#ifdef UPB_FASTTABLE
   // To statically initialize the tables of variable length, we need a flexible
   // array member, and we need to compile in gnu99 mode (constant initialization
   // of flexible array members is a GNU extension, not in C99 unfortunately.

upb/wire/internal/decode_fast.c

@@ -914,8 +914,8 @@ const char* fastdecode_tosubmsg(upb_EpsCopyInputStream* e, const char* ptr,
   upb_Message** dst;                                                      \
   uint32_t submsg_idx = (data >> 16) & 0xff;                              \
   const upb_MiniTable* tablep = decode_totablep(table);                   \
-  const upb_MiniTable* subtablep = upb_MiniTableSub_Message(              \
-      *UPB_PRIVATE(_upb_MiniTable_GetSubByIndex)(tablep, submsg_idx));    \
+  const upb_MiniTable* subtablep =                                        \
+      UPB_PRIVATE(_upb_MiniTable_GetSubTableByIndex)(tablep, submsg_idx); \
   fastdecode_submsgdata submsg = {decode_totable(subtablep)};             \
   fastdecode_arr farr;                                                    \
                                                                           \