buildPutFile crashes on valid input

[jacobkeeler]

The buildPutFile function in SDLRPCRequestFactory throws an exception when it is given a valid fileType value. The reason for this appears to be this line:

msg.fileType = [fileType mutableCopy];

I would assume that this is just a copy-paste error, but it is impossible to create a mutable copy of an SDLEnum object, as it does not conform to NSMutableCopying. As a result, whenever this line is executed an exception will be thrown.

The line should just be:

msg.fileType = fileType;