checking 2nd level of FT index destroyed info->lastkey and CHECK TABLE...

checking 2nd level of FT index destroyed info->lastkey and CHECK TABLE erroneously treated table as corrupted
bug#2190

myisam/mi_check.c

@@ -551,7 +551,7 @@ static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
 		     ha_checksum *key_checksum, uint level)
 {
   int flag;
-  uint used_length,comp_flag,nod_flag,key_length,not_used;
+  uint used_length,comp_flag,nod_flag,key_length=0,not_used;
   uchar key[MI_MAX_POSSIBLE_KEY_BUFF],*temp_buff,*keypos,*old_keypos,*endpos;
   my_off_t next_page,record;
   char llbuff[22];
@@ -586,6 +586,8 @@ static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
   }
   for ( ;; )
   {
+    memcpy((char*) info->lastkey,(char*) key,key_length);
+    info->lastkey_length=key_length;
     if (nod_flag)
     {
       next_page=_mi_kpos(nod_flag,keypos);
@@ -629,8 +631,6 @@ static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
     }
     (*key_checksum)+= mi_byte_checksum((byte*) key,
 				       key_length- info->s->rec_reflength);
-    memcpy((char*) info->lastkey,(char*) key,key_length);
-    info->lastkey_length=key_length;
     record= _mi_dpos(info,0,key+key_length);
     if (keyinfo->flag & HA_FULLTEXT) /* special handling for ft2 */
     {
@@ -658,7 +658,7 @@ static int chk_index(MI_CHECK *param, MI_INFO *info, MI_KEYDEF *keyinfo,
       DBUG_PRINT("test",("page: %s  record: %s  filelength: %s",
 			 llstr(page,llbuff),llstr(record,llbuff2),
 			 llstr(info->state->data_file_length,llbuff3)));
-      DBUG_DUMP("key",(byte*) info->lastkey,key_length);
+      DBUG_DUMP("key",(byte*) key,key_length);
       DBUG_DUMP("new_in_page",(char*) old_keypos,(uint) (keypos-old_keypos));
       goto err;
     }