ITS#8321 don't skip fixups on splitting cursors

Adjustments can't be skipped, in recursive calls each level must
fixup their own level.

libraries/liblmdb/mdb.c

@@ -1161,7 +1161,6 @@ struct MDB_cursor {
 #define C_EOF	0x02			/**< No more data */
 #define C_SUB	0x04			/**< Cursor is a sub-cursor */
 #define C_DEL	0x08			/**< last op was a cursor_del */
-#define C_SPLITTING	0x20		/**< Cursor is in page_split */
 #define C_UNTRACK	0x40		/**< Un-track cursor when closing */
 /** @} */
 	unsigned int	mc_flags;	/**< @ref mdb_cursor */
@@ -8314,7 +8313,6 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 		DPRINTF(("parent branch page is %"Z"u", mc->mc_pg[ptop]->mp_pgno));
 	}
 
-	mc->mc_flags |= C_SPLITTING;
 	mdb_cursor_copy(mc, &mn);
 	mn.mc_pg[mn.mc_top] = rp;
 	mn.mc_ki[ptop] = mc->mc_ki[ptop]+1;
@@ -8494,7 +8492,6 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 		rc = mdb_node_add(&mn, mn.mc_ki[ptop], &sepkey, NULL, rp->mp_pgno, 0);
 		mn.mc_top++;
 	}
-	mc->mc_flags ^= C_SPLITTING;
 	if (rc != MDB_SUCCESS) {
 		goto done;
 	}
@@ -8615,8 +8612,6 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 				m3->mc_snum++;
 				m3->mc_top++;
 			}
-			if (m3->mc_flags & C_SPLITTING)
-				continue;
 			if (m3->mc_top >= mc->mc_top && m3->mc_pg[mc->mc_top] == mp) {
 				if (m3->mc_ki[mc->mc_top] >= newindx && !(nflags & MDB_SPLIT_REPLACE))
 					m3->mc_ki[mc->mc_top]++;