Fixed bug in GetFileSize() where -1 wouldn't be returned even when there was a problem retrieving the file size.
Fixed bug in GetFileSize() where -1 wouldn't be returned even when there was a problem retrieving the file size.

hgupta9/FluentFTP,shaneray/ShaneSpace.FtpClient,kendallb/System.Net.FtpClient,worstenbrood/FluentFTP,robinrodricks/FluentFTP,robinrodricks/FluentFTP,shaneray/ShaneSpace.FtpClient,robinrodricks/FluentFTP