Portability fixes (and a typo after last merge)

innobase/os/os0file.c:
  Fixed typo
sql/sql_class.h:
  Portability fix

innobase/os/os0file.c

@@ -733,7 +733,7 @@ os_file_create_directory(
 	if (!(rcode != 0 ||
 		   (GetLastError() == ERROR_FILE_EXISTS && !fail_if_exists))) {
 		/* failure */
-		os_file_handle_error(Npathname, "CreateDirectory");
+		os_file_handle_error(pathname, "CreateDirectory");
 
 		return(FALSE);
 	}

sql/sql_class.h

@@ -932,7 +932,7 @@ public:
     net.last_errno= 0;
     net.report_error= 0;
   }
-  inline bool vio_ok() const { return net.vio; }
+  inline bool vio_ok() const { return net.vio != 0; }
 #else
   void clear_error();
   inline bool vio_ok() const { return true; }