bug #26074 Mysql crash creating partition

As we have unified paths inside partition engine, we should look for '/'
as a path separator

mysql-test/r/windows.result

@@ -26,3 +26,18 @@ ERROR HY000: No paths allowed for shared library
 execute abc;
 ERROR HY000: No paths allowed for shared library
 deallocate prepare abc;
+CREATE TABLE t1 (
+`pkid` int(11) NOT NULL AUTO_INCREMENT,
+`SALES_DATE` date NOT NULL DEFAULT '0000-00-00',
+KEY `pkid` (`pkid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+PARTITION BY RANGE (MONTH(SALES_DATE))
+(
+PARTITION p0 VALUES LESS THAN (2) ENGINE=INNODB
+data DIRECTORY='c:/tmp/'
+		index DIRECTORY = 'c:/tmp/',
+PARTITION p1 VALUES LESS THAN (3) ENGINE=INNODB
+data DIRECTORY='c:/tmp/'
+		index DIRECTORY = 'c:/tmp/'
+);
+drop table t1;

mysql-test/t/windows.test

 # Windows-specific tests
 --source include/windows.inc
+-- source include/have_innodb.inc
 
 #
 # Bug 9148: Denial of service
@@ -49,3 +50,23 @@ execute abc;
 execute abc;
 deallocate prepare abc;
 
+#
+# Bug #26074 Mysql crash when creating partitions 
+#
+
+CREATE TABLE t1 (
+  `pkid` int(11) NOT NULL AUTO_INCREMENT,
+  `SALES_DATE` date NOT NULL DEFAULT '0000-00-00',
+  KEY `pkid` (`pkid`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+PARTITION BY RANGE (MONTH(SALES_DATE))
+(
+        PARTITION p0 VALUES LESS THAN (2) ENGINE=INNODB
+                data DIRECTORY='c:/tmp/'
+                index DIRECTORY = 'c:/tmp/',
+        PARTITION p1 VALUES LESS THAN (3) ENGINE=INNODB
+                data DIRECTORY='c:/tmp/'
+                index DIRECTORY = 'c:/tmp/'
+);
+
+DROP TABLE t1;

sql/ha_partition.cc

@@ -1781,7 +1781,8 @@ int ha_partition::set_up_table_before_create(TABLE *table,
   }
   table->s->max_rows= part_elem->part_max_rows;
   table->s->min_rows= part_elem->part_min_rows;
-  partition_name= strrchr(partition_name_with_path, FN_LIBCHAR);
+  /* Here we have unified path so should always look for '/', not FN_LIBCHAR */
+  partition_name= strrchr(partition_name_with_path, '/');
   if ((part_elem->index_file_name &&
       (error= append_file_to_dir(thd,
                                  (const char**)&part_elem->index_file_name,