Silence a valgrind warning caused by zlib:

innodb.innodb-zip                        [ fail ]  Found warnings/errors in server log file!
        Test ended at 2010-05-17 16:41:25
line
==31182== Thread 13:
==31182== Conditional jump or move depends on uninitialised value(s)
==31182==    at 0xA9193F: longest_match (deflate.c:1143)
==31182==    by 0xA92C19: deflate_slow (deflate.c:1595)
==31182==    by 0xA90C6B: deflate (deflate.c:790)
==31182==    by 0x928A07: btr_store_big_rec_extern_fields (btr0cur.c:4092)
==31182==    by 0x9C9B90: row_ins_index_entry_low (row0ins.c:2119)
==31182==    by 0x9C9DFB: row_ins_index_entry (row0ins.c:2167)
==31182==    by 0x9CA057: row_ins_index_entry_step (row0ins.c:2252)
==31182==    by 0x9CA0FD: row_ins (row0ins.c:2384)
==31182==    by 0x9CA760: row_ins_step (row0ins.c:2494)
==31182==    by 0x8CBF7E: row_insert_for_mysql (row0mysql.c:1138)
==31182==    by 0x8BCF32: ha_innobase::write_row(unsigned char*) (ha_innodb.cc:4929)
==31182==    by 0x736E03: handler::ha_write_row(unsigned char*) (handler.cc:4682)
==31182==    by 0x5B0EEE: write_record(THD*, TABLE*, st_copy_info*) (sql_insert.cc:1670)
==31182==    by 0x5B129D: select_insert::send_data(List<Item>&) (sql_insert.cc:3279)
==31182==    by 0x5F31ED: end_send(JOIN*, st_join_table*, bool) (sql_select.cc:12428)
==31182==    by 0x5F9B9B: evaluate_join_record(JOIN*, st_join_table*, int) (sql_select.cc:11632)

mysql-test/valgrind.supp

@@ -173,6 +173,15 @@
    fun:do_flush
 }
 
+{
+   libz longest_match called from InnoDB
+   Memcheck:Cond
+   fun:longest_match
+   fun:deflate_slow
+   fun:deflate
+   fun:btr_store_big_rec_extern_fields
+}
+
 {
    libz longest_match2
    Memcheck:Cond