MDEV-25107 Check TABLE miscalutates the length of column

- This is caused by merge commit a26e7a37.
InnoDB fails to fetch the next index field when there is a externally
stored column length check involved.

storage/innobase/btr/btr0btr.cc

@@ -4673,7 +4673,7 @@ btr_index_rec_validate(
 				ulint extern_len = mach_read_from_4(
 					data + len + BTR_EXTERN_LEN + 4);
 				if (fixed_size == extern_len) {
-					continue;
+					goto next_field;
 				}
 			}
 		}
@@ -4708,7 +4708,7 @@ btr_index_rec_validate(
 			}
 			return(FALSE);
 		}
-
+next_field:
 		field++;
 	}