Fix some overwrite quirks

Was skipping the overwrite in some cases, if the cmp function
said the new and old already matched. We should always perform
the overwrite anyway, since the cmp function may only be doing
a prefix compare and the data may actually be different.

libraries/liblmdb/mdb.c

@@ -5457,8 +5457,10 @@ set1:
 	mc->mc_flags &= ~C_EOF;
 
 	if (IS_LEAF2(mp)) {
+		if (op == MDB_SET_RANGE || op == MDB_SET_KEY) {
 			key->mv_size = mc->mc_db->md_pad;
 			key->mv_data = LEAF2KEY(mp, mc->mc_ki[mc->mc_top], key->mv_size);
+		}
 		return MDB_SUCCESS;
 	}
 
@@ -5942,13 +5944,12 @@ mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
 	} else {
 		/* there's only a key anyway, so this is a no-op */
 		if (IS_LEAF2(mc->mc_pg[mc->mc_top])) {
+			char *ptr;
 			unsigned int ksize = mc->mc_db->md_pad;
 			if (key->mv_size != ksize)
 				return MDB_BAD_VALSIZE;
-			if (flags == MDB_CURRENT) {
-				char *ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize);
+			ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize);
 			memcpy(ptr, key->mv_data, ksize);
-			}
 			return MDB_SUCCESS;
 		}
 
@@ -5978,12 +5979,12 @@ more:
 				if (mc->mc_dbx->md_dcmp == mdb_cmp_int && olddata.mv_size == sizeof(size_t))
 					mc->mc_dbx->md_dcmp = mdb_cmp_clong;
 #endif
-				/* if data matches, skip it */
+				/* does data match? */
 				if (!mc->mc_dbx->md_dcmp(data, &olddata)) {
 					if (flags & MDB_NODUPDATA)
 						return MDB_KEYEXIST;
-					rc = MDB_SUCCESS;
-					goto next_sub;
+					/* overwrite it */
+					goto current;
 				}
 
 				/* Back up original data item */
@@ -6259,7 +6260,6 @@ put_sub:
 			 */
 			mc->mc_flags |= C_INITIALIZED;
 		}
-next_sub:
 		if (flags & MDB_MULTIPLE) {
 			if (!rc) {
 				mcount++;