Allow multiple calls to mysql_server_end()

(Part of fix for Bug#25621 Error in my_thread_global_end(): 1 threads didn't exit)
Give correct error message if InnoDB table is not found
(This allows us to drop a an innodb table that is not in the InnoDB registery)

.bzrignore

@@ -1341,3 +1341,6 @@ win/vs71cache.txt
 win/vs8cache.txt
 zlib/*.ds?
 zlib/*.vcproj
+debian/control
+debian/defs.mk
+include/abi_check

libmysql/libmysql.c

@@ -168,8 +168,23 @@ int STDCALL mysql_server_init(int argc __attribute__((unused)),
 }
 
 
+/*
+  Free all memory and resources used by the client library
+
+  NOTES
+    When calling this there should not be any other threads using
+    the library.
+
+    To make things simpler when used with windows dll's (which calls this
+    function automaticly), it's safe to call this function multiple times.
+*/
+
+
 void STDCALL mysql_server_end()
 {
+  if (!mysql_client_init)
+    return;
+
 #ifdef EMBEDDED_LIBRARY
   end_embedded_server();
 #endif

mysql-test/r/innodb_mysql.result

@@ -625,4 +625,12 @@ t1	CREATE TABLE `t1` (
   `a` int(11) default NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='123'
 drop table t1;
+create table t1 (a int) engine=innodb;
+select * from t2;
+ERROR 42S02: Table 'test.t2' doesn't exist
+drop table t1;
+drop table t2;
+ERROR 42S02: Unknown table 't2'
+create table t2 (a int);
+drop table t2;
 End of 5.0 tests

mysql-test/t/innodb_mysql.test

@@ -605,4 +605,18 @@ alter table t1 comment '123';
 show create table t1;
 drop table t1;
 
+#
+# Test bug when trying to drop data file which no InnoDB directory entry
+#
+
+create table t1 (a int) engine=innodb;
+copy_file $MYSQLTEST_VARDIR/master-data/test/t1.frm $MYSQLTEST_VARDIR/master-data/test/t2.frm;
+--error 1146
+select * from t2;
+drop table t1;
+--error 1051
+drop table t2;
+create table t2 (a int);
+drop table t2;
+
 --echo End of 5.0 tests

sql/ha_innodb.cc

@@ -504,7 +504,7 @@ convert_error_code_to_mysql(
 
  	} else if (error == (int) DB_TABLE_NOT_FOUND) {
 
-    		return(HA_ERR_KEY_NOT_FOUND);
+    		return(HA_ERR_NO_SUCH_TABLE);
 
   	} else if (error == (int) DB_TOO_BIG_RECORD) {